Growing community of inventors

Glendale, CA, United States of America

Wolfgang Spiegelstein

Average Co-Inventor Count = 1.14

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 = 45

Wolfgang SpiegelsteinHarvey J Hill (1 patent)Wolfgang SpiegelsteinWolfgang Spiegelstein (4 patents)Harvey J HillHarvey J Hill (3 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Kennedy Company (2 from 5 patents)

2. Irwin Magnetic Systems, Inc. (1 from 14 patents)

3. Roberts Consolidated Industries, Inc. (1 from 8 patents)


4 patents:

1. 4807067 - Cartridge tape drive

2. D291797 - Electric motor housing

3. 4673995 - Cartridge tape drive with friction roller to open cartridge door

4. 4262418 - Boot for trimmer for resilient floor covering material

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as of
12/19/2025
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