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Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
JL

John C. Layman — 5 Patents

Delphi Technologies: 4 patents #801 of 4,124Top 20%
General Motors: 1 patents #9,441 of 18,328Top 55%
Union, OH: #7 of 40 inventorsTop 20%
Ohio: #15,931 of 73,341 inventorsTop 25%
Overall (All Time): #907,971 of 4,157,543Top 25%
5 Patents All Time
John C. Layman has been granted 5 US patents while listed as an inventor at Delphi Technologies. The first was granted in 1991 and the most recent in March 2005. John C. Layman ranks #907,971 of 4,157,543 US inventors in our database (top 21.8%). Patent records list John C. Layman in Union, OH, US.

Patents per Year

Patents granted per year, 1991 to 2005Bar chart with a peak of 2 patents in 2003.peak 21991: 1 patents19912003: 2 patents20032004: 1 patents20042005: 1 patents2005

Issued Patents All Time

Showing 1–5 of 5 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
6871496 Adjustable dual center port compensation for master cylinder Michel Vermoesen, Byengsu Kim 2005-03-29 $1,315,000
6766644 Master cylinder with by-pass function and proportioning valve Michel Vermoesen, Byengsu Kim 2004-07-27 $6,595,000
6619039 Brake master cylinder-sensor system and method James William Zehnder, II, Alan H. Green, Elaine A. Ruble, Schuyler S. Shaw 2003-09-16 $3,885,000
6549126 Dry interface corner actuator single sensor for lining wear and low reservoir detection John Benjamin Hageman, Paul Rymoff, Ernst Baumgartner 2003-04-15 $1,495,000
5025628 Master cylinder reservoir diaphragm venting arrangement Cecil C. Pugh 1991-06-25