John Doyle — 3 Patents at Fmc | Patent Leaderboard

John Doyle has been granted 3 US patents while listed as an inventor at Fmc. The first was granted in 1987 and the most recent in November 2021. John Doyle ranks #1,328,092 of 4,157,543 US inventors in our database (top 31.9%). Patent records list John Doyle in Calgary, AB, CA.

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
11171580	Brake system and controller for use with a wellhead direct drive	Al Duerr, Aaron Brassard, Wray Sparling	2021-11-09
10221633	Sucker rod shear couplers	Arnold Wollmann, Aaron Brassard, Wray Sparling	2019-03-05
4644785	Hinged strain cell mounting apparatus	—	1987-02-24	$2,354,000

John Doyle — 3 Patents

Issued Patents All Time

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