RH

Robert F. Helwing

SI Sri International: 2 patents #450 of 1,272Top 40%
📍 Sunnyvale, CA: #6,534 of 14,302 inventorsTop 50%
🗺 California: #149,087 of 386,348 inventorsTop 40%
Overall (All Time): #1,671,083 of 4,157,543Top 45%
3
Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
4842868 Covalently bonded active agents with carbonium ion base groups 1989-06-27
4532335 Preparation of ketene acetals by rearrangement of allyl and substituted allyl acetals 1985-07-30
4304767 Polymers of di- (and higher functionality) ketene acetals and polyols Jorge Heller, Donald W. H. Penhale 1981-12-08