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St. Louis County, MO, United States of America

Harold E Koeln

USPTO Granted Patents = 4

Average Co-Inventor Count = 1.6

ph-index = 3

Forward Citations = 38(Granted Patents)

Location History:

Kirkwood, MO (US) (1979)
St. Louis County, MO (US) (1980 - 1988)

Company Filing History:

Penn Corporation

Years Active: 1979-1988

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4 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 4786197 - Twist actuated writing instrument (1988-11-22),

2. 4257713 - Conical pen (1981-03-24),

3. 4217712 - Conical pen (1980-08-19),

4. 4161374 - Twist retractable writing implement (1979-07-17),

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