Legal Opinion
Peter A. Hammerquist v. Clarke's Sheet Metal, Inc.
Court of Appeals for the Ninth Circuit
Decided October 13, 1981No. 79-4589PublishedCited by 14 opinions
1Opinion of the Court
GOODWIN, Circuit Judge.
Clarke’s Sheet Metal, Inc. appeals from a judgment, following a jury verdict, that held claims 1, 2 and 3 of Hammerquist’s U.S. Patent No. 3,854,910 to be valid and willfully infringed.
The Hammerquist patent claims described an apparatus for collecting dust from industrial plants. The apparatus is a combination of devices: (1) a dust collector for heavy dust particles known as a “centrifugal dust collector” (often called a cyclone); and (2) a dust filtering device for smaller particles (often called a baghouse) composed of a chamber within which is housed a circular…
2Cases cited29 opinions
- Graham v. John Deere Co. of Kansas CitySupreme Court of the United States · 1966
- Hormel v. HelveringSupreme Court of the United States · 1941
- Great Atlantic & Pacific Tea Co. v. Supermarket Equipment Corp.Supreme Court of the United States · 1951
- Lincoln Engineering Co. v. Stewart-Warner Corp.Supreme Court of the United States · 1938
- Anderson's-Black Rock, Inc. v. Pavement Salvage Co.Supreme Court of the United States · 1969
24 more not listed; retrieve them via the Exa API.
3Cited by14 opinions
- Railroad Dynamics, Inc., Appellant/cross-Appellee v. A. Stucki Company, Appellee/cross-AppellantCourt of Appeals for the Federal Circuit · 1984
- Richardson v. Suzuki Motor Co.Court of Appeals for the Federal Circuit · 1989
- Richardson v. Suzuki Motor Co., Ltd.Court of Appeals for the Federal Circuit · 1989
- Fleury v. Harper & Row, Publishers, Inc.Court of Appeals for the Ninth Circuit · 1983
- A. B. Baumstimler v. Bueford B. Rankin, Kenneth J. LaughlinCourt of Appeals for the Fifth Circuit · 1982
9 more not listed; retrieve them via the Exa API.