US3540998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural adsorptive treatment
Assignee: Gulf Research and Development Co
•
Filing: 1967-12-27
•
Granted: 1970-11-17
•
Expires: 1987-12-27
Abstract
No abstract record available.
Inventors
- 👤 Paul G Bercik
- 👤 Alfred M Henke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:39
CPC Classifications
C; C07; C07C; C07C9/00; C07C5/00; C07C5/22; C07C5/27; C07C5/2767; C07C5/277; C07C5/2791; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2939833A
Cited
US2937215A
Cited
US2909583A
Cited
US2966531A
Cited
US3094569A
Cited
US3063934A
Cited
US3321396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |