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Peter C. Spellar — 4 Patents

FRFrick: 4 patents #3 of 15Top 20%
Hagerstown, MD: #41 of 223 inventorsTop 20%
Maryland: #8,090 of 35,612 inventorsTop 25%
Overall (All Time): #1,080,739 of 4,157,543Top 30%
4 Patents All Time
Peter C. Spellar has been granted 4 US patents while listed as an inventor at Frick. The first was granted in 1985 and the most recent in July 1987. Peter C. Spellar ranks #1,080,739 of 4,157,543 US inventors in our database (top 26.0%). Patent records list Peter C. Spellar in Hagerstown, MD, US.

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDate
4678406 Variable volume ratio screw compressor with step control Joseph W. Pillis, David A. Murphy, Paul Nemit, Jr. 1987-07-07
4548549 Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current David A. Murphy 1985-10-22
4519748 Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current David A. Murphy 1985-05-28
4516914 Micro-processor control of moveable slide stop and a moveable slide valve in a helical screw rotary compressor David A. Murphy 1985-05-14

Frequent Collaborators

David A. Murphy4 shared
Paul Nemit, Jr.1 shared
Joseph W. Pillis1 shared

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Aviel FOGEL4
Eric Matthew Walton4