HA

Hellmut Ahhe

SA Siemens Aktiengesellschaft: 1 patents #104 of 616Top 20%
📍 Simmerath, DE: #3 of 8 inventorsTop 40%
Overall (1994): #161,000 of 165,921Top 100%
1
Patents 1994

Issued Patents 1994

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5360693 Positive o-quinone diazide photoresist containing base copolymer utilizing monomer having anhydride function and further monomer that increases etch resistance Michael Sebald, Recai Sezi, Rainer Leuschner, Seigfried Birkle 1994-11-01