Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Douglas E. Leng — 5 Patents

EAE.I. Du Pont De Nemours And: 5 patents #2,307 of 12,129Top 20%
Midland, MI: #868 of 2,814 inventorsTop 35%
Michigan: #18,552 of 86,293 inventorsTop 25%
Overall (All Time): #907,971 of 4,157,543Top 25%
5 Patents All Time
Douglas E. Leng has been granted 5 US patents. The first was granted in 1980 and the most recent in December 1986. Douglas E. Leng ranks #907,971 of 4,157,543 US inventors in our database (top 21.8%). Patent records list Douglas E. Leng in Midland, MI, US.

Patents per Year

Patents granted per year, 1980 to 1986Bar chart with a peak of 2 patents in 1985.peak 21980: 1 patents19801985: 2 patents19851986: 2 patents1986

Issued Patents All Time

Showing 1–5 of 5 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
4631175 Preparation of chlorinated polyolefins James B. Akers, Jr., Randall J. Normand 1986-12-23 $2,660,000
4623706 Process for preparing uniformly sized polymer particles by suspension polymerization of vibratorily excited monomers in a gaseous or liquid stream Edward E. Timm 1986-11-18 $4,631,000
4524189 Preparation of chlorinated polyolefins James B. Akers, Jr., Randall J. Normand 1985-06-18 $2,528,000
4502888 Aqueous dispersions of plasticized polymer particles Wilmer L. Sigelko, Frank L. Saunders 1985-03-05 $7,013,000
4237110 Process for separating and recovering concentrated hydrochloric acid from the crude product obtained from the acid hydrolysis of cellulose Allen V. Forster, Lyle E. Martz 1980-12-02 $5,014,000