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David Larkins — 2 Patents

HDHydrochem Developments: 1 patents #4 of 4Top 100%

RMRobbins & Myers: 1 patents #3 of 15Top 20%

Brampton, CA: #316 of 1,005 inventorsTop 35%

Overall (All Time): #1,709,992 of 4,157,543Top 45%

2 Patents All Time

David Larkins has been granted 2 US patents while listed as an inventor at Hydrochem Developments. The first was granted in 1989 and the most recent in April 1994. David Larkins ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list David Larkins in Brampton, ON, CA.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
5303933	Shut-off seal for a rotatable shaft	—	1994-04-19	$1,508,000
4878677	Shut off seal about a shaft of a device having a side entry into a tank	John C. Schneider	1989-11-07

David Larkins — 2 Patents

Issued Patents All Time

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