US3495933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of gases containing acidic impurities
Assignee: IFP Energies nouvelles
•
Filing: 1966-03-18
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Granted: 1970-02-17
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Expires: 1986-03-18
Abstract
No abstract record available.
Inventors
- 👤 Philippe Renault
- 👤 Sigismond Franckowiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:41
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/08; C10K1/16; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/52; B01D53/526; C07; C07C; C07C7/00; C07C7/11; C10G; C10G5/00; C10G5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1946489A
Cited
US2383416A
Cited
US2623611A
Cited
US2781863A
Cited
US2975026A
Cited
US3334469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |