Growing community of inventors

Inver Grove Heights, MN, United States of America

Douglas A Schaffer

Average Co-Inventor Count = 2.25

ph-index = 3

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 171

Douglas A SchafferMichael M Richardson (3 patents)Douglas A SchafferRonald F Tuckner (1 patent)Douglas A SchafferDouglas A Schaffer (3 patents)Michael M RichardsonMichael M Richardson (18 patents)Ronald F TucknerRonald F Tuckner (6 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Kroy LLC (3 from 39 patents)


3 patents:

1. 4678353 - Tape supply cartridge

2. 4624590 - Lettering apparatus

3. 4557617 - Tape supply cartridge

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as of
12/30/2025
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