Antaeus Foundation Equipment LLC v. American Piledriving Equipment Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Antaeus Foundation Equipment, LLC (Washington)
  • Defendant: American Piledriving Equipment, Inc. (Washington)
  • Plaintiff’s Counsel: Borde Law PLLC
• Case Identification: 2:26-cv-00455, W.D. Wash., 02/06/2026
• Venue Allegations: Venue is alleged to be proper in the Western District of Washington because the defendant, American Piledriving Equipment, Inc. ("APE"), resides in the district, maintains a regular and established place of business there, and relevant alleged acts occurred within the district.
• Core Dispute: Plaintiff alleges that Defendant’s "APE Hanger" product, a vibration suppression system, infringes a patent related to dampening assemblies for vibratory pile drivers.
• Technical Context: The technology addresses the intense vibration generated by heavy-duty pile drivers, which can damage the cranes used to operate them and create hazardous conditions.
• Key Procedural History: The complaint alleges a notable history between the parties: the inventor of the patent-in-suit, John L. White, is the CEO of Plaintiff Antaeus and a co-founder of Defendant APE. Plaintiff alleges that Defendant launched the accused product "shortly after" the patent issued and continued selling it after receiving direct notice of infringement. The complaint also includes counts for false advertising and false patent marking based on Defendant's marketing claims.

Case Timeline

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

• Patent Identification: U.S. Patent No. 12,116,744, “DAMPENING ASSEMBLY FOR VIBRATORY PILE DRIVERS,” issued October 15, 2024 (the “’744 Patent”).

• The Invention Explained:

  • Problem Addressed: The patent’s background section describes the problem of shaking and vibration that occurs during the operation of vibratory pile drivers, noting that such effects are undesirable for both operators and the equipment itself ’744 Patent, col. 1:13-18 It further notes that some prior art solutions that use elastomers operating in compression are not fully effective and present a safety risk where the entire load could fall if the elastomer fails ’744 Patent, col. 1:31-35
  • The Patented Solution: The invention is a dampening assembly that connects between a crane and a vibratory pile driver ’744 Patent, Fig. 1 It utilizes "opposing elastomer shock absorbing members" that are connected between an inner assembly and an outer housing ’744 Patent, abstract Critically, when weight is applied, these elastomer members stretch and operate in "shear" rather than compression, a configuration described as a "significant difference" from other systems ’744 Patent, col. 2:47-52 The design also incorporates a "safety pin" that is designed to catch the inner assembly and prevent the load from dropping in the event the elastomers fail ’744 Patent, col. 2:65-col. 3:2
  • Technical Importance: The invention purports to offer a more effective method of vibration reduction by using elastomers in shear, while simultaneously addressing a critical safety flaw in prior systems by including a mechanical fail-safe.

• Key Claims at a Glance:
  The complaint asserts infringement of "one or more claims" without specifying them Compl. ¶25 Independent claim 1 is representative and includes the following essential elements:

  • A lower connecting shackle member for connection to a suspending weight portion of the pile driving system (e.g., the pile driver itself).
  • An upper connecting member for connecting to a crane assembly, where the upper member is connected to an outer housing.
  • An inner assembly connected to the lower connecting shackle member, which includes a safety pin that extends through an opening in the outer housing.
  • An inner housing, part of the inner assembly, that is connected to the outer housing.
  • Opposing elastomer shock absorbing members connected between the inner assembly and the inner housing, which reduce vibration through "a corresponding stretching" when weight is applied.

III. The Accused Instrumentality

• Product Identification: The accused product is the "APE Hanger" Compl. ¶16
• Functionality and Market Context: The APE Hanger is marketed as a "secondary suppression system" designed to reduce vibration transmitted to a crane boom, particularly during the start and stop phases of a vibratory driver's operation Compl., Ex. B, p. 25 Defendant’s marketing materials claim it is "The only patented 2-Stage secondary suppression system to help reduce vibration to the crane" Compl. ¶17; Compl., Ex. B, p. 25 The marketing pamphlet shows the APE Hanger equipped with a "removable Top Lifting Lug" for crane connection and "Two 55-ton safety shackles" for connection to the pile driver Compl., Ex. B, p. 26 This pamphlet image shows a large, yellow mechanical assembly designed to be inserted between a crane line and a pile driver Compl., Ex. B, p. 25

IV. Analysis of Infringement Allegations

The complaint alleges infringement in general terms without providing a technical breakdown or claim chart. The following summary is constructed based on the allegations and the product descriptions provided in the complaint's exhibits.

’744 Patent Infringement Allegations

• Identified Points of Contention:
  • Evidentiary Questions: The complaint lacks any specific allegations or evidence regarding the internal mechanics of the APE Hanger. A primary point of contention will be whether discovery reveals the presence of an "inner assembly," a "safety pin," and "elastomer shock absorbing members" as recited in the claims. The provided marketing materials focus on external features and overall function, not internal construction.
  • Technical Questions: The patent places significant emphasis on the elastomers operating in "shear" via "stretching" ’744 Patent, col. 2:47-52 A central technical question will be what mechanism the APE Hanger uses to suppress vibration. The infringement analysis may depend entirely on whether the accused device achieves dampening through the claimed stretching mechanism or an alternative method, such as compression.

V. Key Claim Terms for Construction

• The Term: "opposing elastomer shock absorbing members"

• Context and Importance: This term defines the core functional component of the invention. The infringement analysis will likely turn on whether the internal components of the APE Hanger, whatever they may be, fall within the scope of this term.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The specification states that "elastomeric members 44 and 46 are conventional and well known in the pile driver shock absorbing art" ’744 Patent, col. 2:37-38 This language could be used to argue that the term should not be limited to the exact embodiment shown but should encompass any conventional elastomer used for shock absorption in this field.
  • Evidence for a Narrower Interpretation: The patent consistently describes the function of these members as "stretching" and operating in "shear" ’744 Patent, col. 2:47-52; ’744 Patent, col. 3:38 The summary of the invention also frames the operation in terms of "stretching of the opposing elastomer members" ’744 Patent, col. 1:56-58 This may support a narrower construction that requires the members to be configured to operate in shear, potentially excluding systems that use elastomers in compression.

• The Term: "safety pin"

• Context and Importance: This element describes a key safety feature. Proving infringement requires showing that the accused product has a structure corresponding to this limitation. Practitioners may focus on this term because it represents a specific structural element that may be absent from the accused product.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The claim language itself is functional, requiring a "safety pin extending through an opening in the outer housing" ’744 Patent, col. 3:31-33 One might argue that any pin-like structure that serves a fail-safe purpose by interacting with an outer housing meets this definition.
  • Evidence for a Narrower Interpretation: The specification describes a specific action: "pin 40 falls to its lowest position in the outer housing" upon elastomer failure to maintain the connection ’744 Patent, col. 2:65-col. 3:2 This could support an interpretation requiring a structure that operates via gravity in a vertical slot upon failure, as opposed to other types of mechanical fail-safes.

VI. Other Allegations

• Indirect Infringement: The complaint alleges inducement of infringement, stating that APE encourages infringing use through its "marketing, promotion, sales, and the provision of instructions and materials describing and promoting infringing uses of the APE Hanger" Compl. ¶33
• Willful Infringement: Willfulness is alleged based on Defendant APE having "specific knowledge of the '744 Patent at the time of its infringement" and, at a minimum, continuing its alleged infringement after receiving direct notice from Antaeus on or about October 8, 2025 Compl. ¶¶29, 34

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

The dispute as framed by the complaint raises several fundamental questions for the court.

• A core issue will be one of technical mechanism: Does the APE Hanger’s internal suppression system operate using "opposing elastomer shock absorbing members" that "stretch" (i.e., operate in shear), as required by the patent's claims and detailed description, or does it employ a different, non-infringing technology? The complaint's lack of technical detail on the accused product's operation makes this the central evidentiary question.
• A second key question will be one of structural correspondence: Does the APE Hanger contain a distinct "safety pin" that functions as a fail-safe by engaging with an outer housing upon failure of the primary dampening mechanism, or does it lack this specific claimed safety feature?
• Finally, the case presents a significant question of prior knowledge and intent, amplified by the alleged history between the parties where the plaintiff's CEO and patent inventor is a co-founder of the defendant company. This context will be highly relevant to the claims of willful infringement.