US3487621A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-liquid contact apparatus
Assignee: Rhone Poulenc SA
•
Filing: 1967-05-23
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Granted: 1970-01-06
•
Expires: 1987-05-23
Abstract
No abstract record available.
Inventors
- 👤 Georges Bichet
- 👤 Pierre Joseph Frechet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:37
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/20; B01J8/22; B01J8/224; B01J8/228; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/232; B01F23/2323; B01F25/00; B01F25/50; B01F25/53
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1670660A
Cited
FR840935A
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US2560072A
Cited
CH297394A
Cited
US2878891A
Cited
US3105778A
Cited
US3138442A
Cited
FR1281461A
Cited
US3203156A
Cited
US3238021A
Cited
US3324632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |