Patent Case Law Updates - August 2021

Aug 02 2021

Olaf Soot Design, LLC v. Daktronics, Inc., 839 F. App'x 505, 508 (Fed. Cir. 2021)

Key Takeaways:

  • District Courts must resolve claim construction disputes
  • When claim language makes clear that two components are separate components, one element cannot be treated as part of the other.

In Olaf, the district court failed to resolve the parties’ dispute as to claim construction and allowed the dispute to be tried to the jury. The Federal Circuit made quick work of this issue, reiterating its holding in O2 Micro International Ltd. v. Beyond Innovation Technology Co., where it held that “[w]hen the parties present a fundamental dispute regarding the scope of a claim term, it is the court's duty to resolve it.” 521 F.3d 1351, 1362 (Fed. Cir. 2008). 

Olaf involved U.S. Patent No. 6,520,485 (the ‘485 patent). The ’485 patent is directed to a theater winch for moving scenery and lighting by winding and unwinding cables, which are attached to the scenery, around a drum. The portion of Claim 27—the only claim at issue on appeal—recites:

h) said hollow hub and hollow drum being sized such that the screw can move into the hollow hub to allow the hollow drum to receive the screw as the cable unwinds from or winds up on the drum as the object moves to its respective down or up position.

(emphasis added).

Daktronics's Vortek product is depicted below. As can be seen, the internal passage for the screw ends within the hub, away from the inside of the wider grooved drum member that receives and engages with the cables.


The dispute centered on whether the hub is part of the drum (the wider grooved item to reader’s right). The Federal Circuit found that, based on claim language, the hollow hub was not part of the hollow drum because the claim treats the hub and the drum as separate components, reciting that “both the hollow hub and the hollow drum” are sized to receive the screw. 

Thus, under Federal Circuit’s construction, Daktronic’s product does not infringe literally because the hollow drum of the Daktronic’s product is not able to receive the screw. The product did not infringe under the doctrine of equivalents because such a finding would impermissibly eliminate the requirement in the claim that the hollow drum be able to receive the screw.


Rain Computing, Inc. v. Samsung Elec. Co. Ltd.

Key Takeaway:

  • Failure to provide sufficient structure in the specification for means-plus function limitation results in indefinite claims

Rain sued Samsung for infringing the claims of U.S. Patent No. 9,805,349 (the ’349 patent). The ’349 patent is directed to delivering software application packages to a client terminal in a network based on user demands. The dispute was focused on the following claim limitation:

sending, to the user, a user identification module configured to control access of said one or more software application packages, and coupling the user identification module to a client terminal device of the user;

(emphasis added)

The Court started by analyzing whether 35 U.S.C. § 112 ¶ 6 applied to the limitation “user identification module”. As a general rule, a term that does not include the specific “means for” language will only be construed as a means-plus-function limitations when it recites a function without reciting sufficient structure for performing the function. The Court concluded that the term was a means-plus-function term because Rain was not able to identify any claim language that provided the structure for performing the claimed user identification function. 

Having determined that the limitation “user identification module” was a means-plus-function claim, the court turned to the specification to identify the function and corresponding structure. In the case of computers, the court noted that where the function is performed by a general-purpose computer or microprocessor, the specification must disclose the algorithm that the computer performs to accomplish that function unless a general-purpose computer without any special programming can perform the function.  

The court found that nothing in the claim language or the written description that provides an algorithm to achieve the “control access” function of the “user identification module.” Without an algorithm to achieve the control access function, the court held that the term “user identification module” lacked sufficient structure which rendered the claims indefinite.

von Briesen & Roper Legal Update is a periodic publication of von Briesen & Roper, s.c. It is intended for general information purposes for the community and highlights recent changes and developments in the legal area. This publication does not constitute legal advice, and the reader should consult legal counsel to determine how this information applies to any specific situation.