Douglas A. Schaffer — 3 Patents at Kroy

Douglas A. Schaffer has been granted 3 US patents while listed as an inventor at Kroy. The first was granted in 1985 and the most recent in July 1987. Douglas A. Schaffer ranks #1,328,092 of 4,157,543 US inventors in our database (top 31.9%). Patent records list Douglas A. Schaffer in Inver Grove Heights, MN, US.

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
4678353	Tape supply cartridge	Michael M. Richardson	1987-07-07
4624590	Lettering apparatus	Michael M. Richardson, Ronald Tuckner	1986-11-25	$699,000
4557617	Tape supply cartridge	Michael M. Richardson	1985-12-10	$779,000

Douglas A. Schaffer — 3 Patents

Issued Patents All Time

Patent Widget