US3435591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for purifying gas
Assignee: ConocoPhillips Co
•
Filing: 1966-09-09
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Granted: 1969-04-01
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Expires: 1986-09-09
Abstract
No abstract record available.
Inventors
- 👤 John R Spencer
- 👤 Walton D Greathouse
- 👤 James H Cheek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:01
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; C; C10; C10G; C10G5/00; C10G5/02; B01D2256/00; B01D2256/24; B01D2259/00; B01D2259/40; B01D2259/40003; B01D2259/40083; B01D2259/40088; B01D2259/403
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3124438A
Cited
US2738858A
Cited
US3061992A
Cited
US3008539A
Cited
US3121002A
Cited
US3161489A
Cited
US3137549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |