US3759839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of a palladium catalyst
Assignee: Hoechst AG
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Filing: 1971-02-22
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Granted: 1973-09-18
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Expires: 1991-02-22
Abstract
Abstract A CARRIER CATALYST CONTAINING PALLADIUM CARBOXYLATE WHICH IS SUITABLE FOR THE ALKENYLATION OF CARBOXYLIC ACIDS WITH OLEFINS IN THE GASEOUS PHASE IS MANUFACTURED BY IMPREGNATING THE CARRIER WITH A SOLUTION CONTAINING A PALLADIUM CARBOXYLATE, DRYING THE IMPRGNATED CARRIER AT TEMPERATURES BELOW 120*C. AND EVAPORATING THE SOLVENT TO A RESIDUAL CONTENT OF LESS THAN 20% BY WEIGHT.
Inventors
- 👤 H Fernholz
- 👤 H Schmidt
- 👤 F Wunder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:12
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01J23/40; B01J23/44; B01J23/60; B01J23/70; B01J23/89; B01J23/8933; B01J23/8953; B01J37/00; B01J37/02; B01J37/0201; B01J37/0203; B01J37/0236; C; C07; C07C; C07C67/00; C07C67/04; C07C67/05; C07C67/055; B01J21/00; B01J21/06; B01J21/08; B01J23/58
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |