Hupfer; Leopold
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hupfer; Leopold.The latest application filed is for "preparation of methyl formate".
- Hupfer; Leopold - Friedelsheim DE
| Patent | Date |
|---|---|
| Preparation of methyl formate Grant 5,401,873 - Zehner , et al. March 28, 1 | 1995-03-28 |
| Preparation of formic acid by thermal cleavage of quaternary ammonium formates Grant 5,294,740 - Kiefer , et al. March 15, 1 | 1994-03-15 |
| Removal of phosgene from off-gases Grant 5,200,163 - Henkelmann , et al. April 6, 1 | 1993-04-06 |
| Preparation of phenylethanols Grant 4,943,667 - Hoelderich , et al. July 24, 1 | 1990-07-24 |
| Recovery of aqueous glyoxylic acid solutions Grant 4,902,828 - Wickenhaeuser , et al. February 20, 1 | 1990-02-20 |
| Preparation of unsaturated and saturated ketones Grant 4,874,899 - Hoelderich , et al. October 17, 1 | 1989-10-17 |
| Preparation of trimethylolalkanes from alkanals and formaldehyde Grant 4,594,461 - Merger , et al. June 10, 1 | 1986-06-10 |
| Preparation of substituted phenols Grant 4,538,009 - Goetz , et al. August 27, 1 | 1985-08-27 |
| Preparation of 1-substituted imidazoles Grant 4,450,277 - Graf , et al. May 22, 1 | 1984-05-22 |
| Preparation of propanediols using a copper-and zinc containing hydrogenation catalyst Grant 4,393,251 - Broecker , et al. July 12, 1 | 1983-07-12 |
| Hydrogenation catalysts for the preparation of propanediols Grant 4,386,018 - Merger , et al. May 31, 1 | 1983-05-31 |
| Hydrogenation catalysts for the preparation of propanediols and processes for the preparation of propanediols, using such catalysts Grant 4,386,219 - Merger , et al. May 31, 1 | 1983-05-31 |
| Manufacture of N-substituted tetrahydro-1,4-oxazines Grant 4,068,077 - Goetz , et al. January 10, 1 | 1978-01-10 |
| Manufacture of hexamethylene diamine Grant 3,972,938 - Voges , et al. August 3, 1 | 1976-08-03 |
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