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Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Robert Carl Witham — 9 Patents

STScroll Technologies: 8 patents #13 of 60Top 25%
Overall (All Time): #535,341 of 4,157,543Top 15%
9 Patents All Time
Robert Carl Witham has been granted 9 US patents while listed as an inventor at Scroll Technologies. The first was granted in 1992 and the most recent in May 2005. Robert Carl Witham ranks #535,341 of 4,157,543 US inventors in our database (top 12.9%). Patent records list Robert Carl Witham in Napier, AR, NZ.

Patents per Year

Patents granted per year, 1992 to 2005Bar chart with a peak of 4 patents in 2002.peak 41992: 1 patents19922002: 4 patents20022003: 1 patents20032004: 2 patents20042005: 1 patents2005

Issued Patents All Time

Showing 1–9 of 9 patents

Patent #TitleCo-InventorsDate
6896499 Scroll compressor with flow restriction and back pressure chamber tap Gregory William Hahn, Gene Fields, Thomas R. Barito 2005-05-24
6761545 Scroll compressor with flow restriction and back pressure chamber tap Gregory William Hahn, Gene Fields, Thomas R. Barito 2004-07-13
6749412 Check valve retainer for a scroll compressor Sudarshan K. Narasipura 2004-06-15
6592344 Press-on insulator dish Marvin Wayne Burchfield, Gregory William Hahn, Brad Allen Meeks 2003-07-15
6491500 Scroll compressor with motor protector in non-orbiting scroll and flow enhancement Zili Sun, Jason Hugenroth 2002-12-10
6454538 Motor protector in pocket on non-orbiting scroll and routing of wires thereto Jason Hugenroth 2002-09-24
6428293 Heat shield with seal between end cap and non-orbiting scroll Todd W. Dewar, Zili Sun, Thomas R. Barito, Gregory William Hahn 2002-08-06
6422843 Oil supply cross-hole in orbiting scroll member Zili Sun 2002-07-23
5174438 Conveyor belt parts and assembly Edward J. Stevenson 1992-12-29