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Harold E. Koeln — 3 Patents

Chesterfield, MO: #1,913 of 6,461 inventorsTop 30%
Missouri: #6,669 of 23,789 inventorsTop 30%
Overall (All Time): #1,328,092 of 4,157,543Top 35%
3 Patents All Time
Harold E. Koeln has been granted 3 US patents. The first was granted in 1980 and the most recent in November 1988. Harold E. Koeln ranks #1,328,092 of 4,157,543 US inventors in our database (top 31.9%). Patent records list Harold E. Koeln in Chesterfield, MO, US.

Patents per Year

Patents granted per year, 1980 to 1988Bar chart with a peak of 1 patents in 1980.peak 11980: 1 patents19801981: 1 patents19811988: 1 patents1988

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
4786197 Twist actuated writing instrument Michael Theodore Lembeck 1988-11-22
4257713 Conical pen Alan Sherman 1981-03-24
4217712 Conical pen — 1980-08-19

Frequent Collaborators

Michael Theodore Lembeck1 shared
Alan Sherman1 shared

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