Kflow HK Ltd v. Aqua Tru LLC

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Kflow (HK) Limited (Hong Kong)
  • Defendant: Aqua Tru, LLC (Delaware); Ideal Living, LLC (Delaware)
  • Plaintiff's Counsel: Law Office of Damian D. Capozzola; Ni, Wang & Massand, PLLC
• Case Identification: Kflow (HK) Limited v. Aqua Tru, LLC, 2:26-cv-06172, C.D. Cal., 07/13/2026
• Venue Allegations: Venue is alleged to be proper as Defendants maintain a regular and established place of business within the Central District of California.
• Core Dispute: Plaintiff seeks a declaratory judgment that its water filtration products do not infringe Defendants' patent, and further seeks a judicial determination that Plaintiff is the rightful owner and inventor of the technology claimed in the patent-in-suit.
• Technical Context: The technology involves point-of-use, countertop reverse osmosis (RO) water filtration systems, a segment of the consumer appliance market focused on providing high-purity drinking water without permanent plumbing installation.
• Key Procedural History: This action was filed in response to an "Intellectual Property Violation" complaint lodged by Defendants against Plaintiff's products on Amazon.com. The complaint alleges that this action is necessary to prevent the delisting of Plaintiff's products from the Amazon platform. Plaintiff also brings a count to correct inventorship and transfer ownership of the patent-in-suit, alleging that its predecessor conceived of the technology and disclosed it to Defendants, who then filed for patent protection without authorization. The complaint references an earlier-filed Chinese patent application by Plaintiff's predecessor covering similar technology.

Case Timeline

Date	Event
2012-2013	Plaintiff's predecessor, Kflow Xiamen, allegedly conceived and developed the underlying technology.
2013-11-06	Kflow Xiamen allegedly filed Chinese Patent Application No. CN 103553228.
2014-01-30	Earliest priority date for the '941 Patent.
2016-08-17	Application for the '941 Patent filed.
2016	Plaintiff Kflow (HK) Limited was formed and acquired Kflow Xiamen.
2020-01-14	U.S. Patent No. 10,532,941 issued.
2026-05-21	Defendants allegedly lodged an infringement complaint against Plaintiff on Amazon.com.
2026-07-13	First Amended Complaint for Declaratory Judgment filed.

II. Technology and Patent(s)-in-Suit Analysis

U.S. Patent No. 10,532,941 - "SYSTEMS AND METHODS FOR WATER FILTRATION"

• Patent Identification: U.S. Patent No. 10,532,941 ("SYSTEMS AND METHODS FOR WATER FILTRATION"), issued January 14, 2020 Compl. ¶18 Compl. ¶20

The Invention Explained

• Problem Addressed: The patent's background describes traditional under-the-sink Reverse-Osmosis (RO) systems as requiring professional installation and being highly inefficient, potentially wasting three to four gallons of water for every gallon of purified water produced in order to prevent membrane clogging '941 Patent, col. 1:28-41
• The Patented Solution: The patent discloses a self-contained, countertop water filtration system that requires no external plumbing connections '941 Patent, col. 1:50-57 The system uses a "support base" with two detachable containers: a "first receptacle" for source (tap) water and a "second receptacle" for the purified "supply" water. Water from the first receptacle is passed through a multi-stage filter system, including an RO membrane. Purified water is sent to the second receptacle, while the waste water (brine) is uniquely routed back into the first receptacle to be reprocessed, significantly reducing overall water waste '941 Patent, abstract '941 Patent, col. 7:5-10 '941 Patent, FIG. 4
• Technical Importance: The invention makes high-efficiency RO filtration accessible in a portable, user-friendly consumer appliance, eliminating the need for permanent installation and addressing the high water waste associated with conventional RO systems '941 Patent, col. 1:50-57

Key Claims at a Glance

• The complaint identifies independent claim 14 as the exemplary claim asserted by Defendants in their Amazon complaint Compl. ¶28 Compl. ¶33
• The essential elements of independent claim 14 are:
  • A point-of-use countertop water filtration system comprising a "support base".
  • A "first receptacle" disposed on the support base to store source water.
  • A "second receptacle" disposed on the support base to store supply water.
  • A "filter system" disposed between the receptacles, itself comprising "sediment and/or carbon filters", an "RO filter", and a "carbon filter".
  • The RO filter is configured to receive water from the sediment/carbon filters, deliver waste water back to the "first receptacle", and deliver second filtered water onward.
  • The final carbon filter is disposed between the RO filter and the "second receptacle" to deliver third filtered water to that second receptacle.
• Plaintiff seeks a declaration of non-infringement of "any claims of the Patent-in-suit" Compl. ¶32

III. The Accused Instrumentality

Product Identification

• Countertop water filter systems sold under the "Bluevua" brand on Amazon.com, identified by ASIN Nos. B0CNPMRFXS and B09KRDK677 Compl. ¶7 Compl. ¶15

Functionality and Market Context

• The complaint describes the Accused Products as having a different physical architecture from the one claimed in the '941 Patent. Specifically, they are alleged to include a "raw-water/wastewater container associated with a body pedestal" and a separate "removable water-purifying kettle positioned on a separate heating structure" Compl. ¶34
• This "removable kettle" is alleged to be a multi-function device serving as a collection and dispensing vessel that, in some embodiments, also incorporates "heating, extraction, and/or refrigeration components" Compl. ¶35
• Plaintiff alleges that the Amazon marketplace is its primary sales channel in the United States, and the delisting threatened by Defendants' infringement complaint would cause significant harm Compl. ¶¶16-17
• No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

The complaint seeks a declaratory judgment of non-infringement. The table below summarizes Plaintiff's arguments as to why its products do not meet the limitations of claim 14 of the '941 Patent.

'941 Patent Infringement Allegations

Claim Element (from Independent Claim 14)	Alleged Non-Infringing Functionality	Complaint Citation	Patent Citation
a support base; a first receptacle disposed on the support base...; a second receptacle disposed on the support base...	The Accused Products allegedly do not have two receptacles on a common support base. Instead, they are alleged to have a "raw-water/wastewater container" on a "body pedestal" and a separate "removable kettle positioned on a separate heating structure."	¶34	col. 12:53-59
a second receptacle disposed on the support base and configured to store supply water	Plaintiff argues the Accused Products' "removable water-purifying kettle" is not a mere "receptacle," as it is a multi-function appliance with heating/refrigeration capabilities and is not disposed on the same support base as the source water container.	¶35	col. 12:58-59
a filter system disposed between the first receptacle and the second receptacle	Plaintiff alleges its products route water through "separate purification and dispensing components that are not arranged in the manner recited by claim 14," asserting a structural and functional distinction.	¶36	col. 12:60-62

• Identified Points of Contention:
  • Scope Questions: The dispute may center on whether the term "support base" can be construed to cover the Accused Product's alleged "body pedestal" and "separate heating structure" combination. Similarly, a question is whether the term "receptacle", which the patent describes as a storage container, can read on the Accused Product's multi-function "kettle" Compl. ¶¶34-35
  • Technical Questions: A factual question for the court will be whether the physical arrangement of the Accused Products-allegedly having separate support structures for the source water container and the purified water kettle-meets the claim limitation that both receptacles are "disposed on the support base." Plaintiff's argument hinges on this alleged structural and functional difference Compl. ¶34

V. Key Claim Terms for Construction

• The Term: "support base"

• Context and Importance: This term is central because Plaintiff's primary non-infringement argument is that its product does not have a single, common "support base" for both water containers Compl. ¶34 The construction of this term will determine if the Accused Product's allegedly separate "pedestal" and "heating structure" can collectively satisfy this limitation.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The specification states the "support base" is "configured to support the various components of the water filtration system" '941 Patent, col. 2:60-61, which could be argued to include an assembly of parts that collectively perform a support function.
  • Evidence for a Narrower Interpretation: Figure 1 of the patent depicts the "support base" (102) as a single, unitary chassis upon which both the first receptacle (104) and second receptacle (134) are directly mounted. The consistent description of both receptacles being "disposed on the support base" may suggest a direct physical interface with a common structural element, as shown in the figures '941 Patent, abstract '941 Patent, col. 12:55 '941 Patent, col. 12:58

• The Term: "receptacle"

• Context and Importance: Plaintiff contends that its "removable water-purifying kettle" is not merely a "receptacle" for storing water but a distinct appliance with added functionality Compl. ¶35 Practitioners may focus on this term to determine if a container with additional, unclaimed features (like heating) falls outside the scope of the claimed term.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The claim language only requires the "receptacle" to be "configured to store" water '941 Patent, col. 12:57 '941 Patent, col. 12:59 The term is not otherwise limited, and the presence of additional features does not necessarily negate its ability to "store water."
  • Evidence for a Narrower Interpretation: The patent's detailed description and figures illustrate the second "receptacle" as a simple dispensing pitcher '941 Patent, FIG. 2 '941 Patent, col. 5:12-21 A party could argue that the term should be limited to such passive storage vessels, and not complex appliances like a "kettle" with active heating or cooling elements, which are not described anywhere in the patent.

VI. Other Allegations

Declaratory Judgment of Ownership and Inventorship

• The complaint includes a separate count seeking a declaratory judgment that Plaintiff is the owner of the '941 Patent and that its employees are the true inventors Compl. ¶¶40-50
• Plaintiff alleges that its predecessor, Kflow Xiamen, conceived and developed the technology from 2012 to 2013 and, at the request of Defendants' agent, provided "four completed prototypes, along with the design and technical documents" Compl. ¶¶42-43
• It is alleged that Defendants obtained this technology through the parties' business relationship and filed the application for the '941 Patent "without authorization, consent, or assignment from Plaintiff" Compl. ¶45
• Plaintiff requests that the court correct the inventorship of the '941 Patent pursuant to 35 U.S.C. § 256 and order the assignment of the patent to Plaintiff Compl. Prayer E Compl. Prayer F

VII. Analyst's Conclusion: Key Questions for the Case

• A dispositive threshold issue will be one of ownership and inventorship: can Plaintiff produce sufficient evidence to prove its claim that its predecessor conceived the invention and that the named inventors on the '941 Patent derived it from prototypes and documents supplied by Plaintiff? An affirmative finding could transfer the patent to Plaintiff and render the infringement dispute moot.
• A central question for infringement will be one of structural equivalence: does the accused product's architecture, allegedly comprising a container on a "pedestal" and a separate multi-function "kettle," satisfy the claim requirement of a "first receptacle" and "second receptacle" both "disposed on" a common "support base" as described and depicted in the patent?
• An underlying validity question is raised by Plaintiff's allegation that its predecessor filed a Chinese patent application in 2013, predating the '941 Patent's 2014 priority date (Compl. ¶¶24; Compl. ¶38). Should the ownership claim fail, a key issue for the court may be whether this prior foreign application constitutes invalidating prior art.