Patent US3755477A successfully refreshed from Google Patents.
US3755477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing fluorinated hydrocarbons
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-06-22
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Granted: 1973-08-28
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Expires: 1990-06-22
Abstract
Abstract AN IMPROVED CHROMIA CATALYST FOR FLUORINATION OF HALOGENATED HYDROCARBONS IS PREPARED BY TREATING A CHROMIUM HYDROXIDE PASTE WITH WATER OR STEAM BEFORE BEING DRIED AND CALCINED.
Inventors
- 👤 R Firth
- 👤 G Foll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:49
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/07; C07C17/087; B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C07C17/093; C07C17/20; C07C17/202; C07C17/206; C07C17/21
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |