Patent US3801651A successfully refreshed from Google Patents.
US3801651A
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Process for the preparation of pyrocatechol and its monoethers
Assignee: Bayer AG
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Filing: 1971-12-20
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Granted: 1974-04-02
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Expires: 1991-12-20
Abstract
Abstract PYROCATECHOL AND ITS MONOETHERS ARE PREPARED BY DEHYDROGENATING THE CORRESPONDING CYCLOHEXANONE COMPOUNDS OVER PALLADIUM ON A LITHIUM-ALUMINUM SPINEL CARRIER AT TEMPERATURES OF 150* C. TO 300*C.
Inventors
- 👤 G Adolphen
- 👤 K Wedemeyer
- 👤 W Sutter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:21
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/70; C07C45/71; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/44; B01J23/54; B01J23/56; B01J23/58; C07C37/00; C07C37/06; C07C37/07; C07C41/00; C07C41/01; C07C41/18; B01J23/005; C07C2601/00; C07C2601/12; C07C2601/14; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |