Douglas B. Firestone

📍 San Diego, CA: #6,385 of 23,606 inventorsTop 30%

🗺 California: #93,399 of 386,348 inventorsTop 25%

Overall (All Time): #888,516 of 4,157,543Top 25%

Patents All Time

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #	Title	Co-Inventors	Date
5616020	Rotary vane pump	—	1997-04-01
4889370	Pipe repair assembly	—	1989-12-26
D258459	Skateboard ramp bowl	—	1981-03-03
D258460	Trailable skateboard ramp	—	1981-03-03
D256713	Skateboard ramp bowl	—	1980-09-02
D256488	Skateboard ramp	—	1980-08-19