American Hoechst Corporation
235Patents
0Active
235Granted
42Portfolio score
Filing activity: Dec 12, 1973 → Nov 5, 1986
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4659774A | Support for solid-phase oligonucleotide synthesis | Chemistry; Metallurgy | 82 | Expired |
| US4493872A | Polyester film coated with metal adhesion promoting copolyester | Emerging Cross-Sectional Technologies | 76 | Expired |
| US4659523A | Production of iodine stainable polyester polarizer film | Chemistry; Metallurgy | 61 | Expired |
| US4863827A | Postive working multi-level photoresist | Physics | 53 | Expired |
| US4198417A | Phenoxyphenylpiperidines | Chemistry; Metallurgy | 52 | Expired |
| US4571363A | Polyester film primed with crosslinked acrylic polymers | Emerging Cross-Sectional Technologies | 52 | Expired |
| US4550069A | Positive photoresist compositions with o-quinone diazide, novolak, and propylene glycol alkyl ether acetate | Physics | 50 | Expired |
| US4081577A | Pulsed spray of fluids | Physics | 46 | Expired |
| US4310600A | Polyester film having abrasion resistant radiation curable silicone coating | Emerging Cross-Sectional Technologies | 45 | Expired |
| US4271281A | Process for preparing styrenic polymer particles | Chemistry; Metallurgy | 44 | Expired |
| US4214035A | Antistatic coated polyester film | Emerging Cross-Sectional Technologies | 43 | Expired |
| US4476189A | Copolyester primed polyester film | Emerging Cross-Sectional Technologies | 42 | Expired |
| US4650738A | Negative working diazo color proofing method | Physics | 42 | Expired |
| US4383897A | Electrochemically treated metal plates | Emerging Cross-Sectional Technologies | 41 | Expired |
| US4241071A | Antidepressant (.alpha.-phenyl-2-tolyl)azacycloalkanes | Chemistry; Metallurgy | 40 | Expired |
| US4435496A | Photopolymer cleavage imaging system | Physics | 39 | Expired |
| US4659642A | Positive working naphthoquinone diazide color proofing transfer process | Physics | 37 | Expired |
| US4585687A | Copolyester primed polyester film | Emerging Cross-Sectional Technologies | 37 | Expired |
| US3962259A | 1,3-Dihydrospiro[isobenzofuran]s and derivatives thereof | Physics | 34 | Expired |
| US4166119A | Analgesic and tranquilizing spiro[dihydrobenzofuran]piperidines and pyrrolidines | Chemistry; Metallurgy | 31 | Expired |
| US4304836A | Surlay proofing method | Physics | 30 | Expired |
| US3959475A | Substituted 1,3-dihydrospiro(isobenzofuran)s | Chemistry; Metallurgy | 30 | Expired |
| US4399021A | Novel electrolytes for electrochemically treated metal plates | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4448647A | Electrochemically treated metal plates | Chemistry; Metallurgy | 28 | Expired |
| US4186199A | Indolo-,1,2-dihydroindolo-, and 1,2,6,7-tetrahydroindolo [1,7-ab][1,5] benzodiazepines | Chemistry; Metallurgy | 28 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.