US3534528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas well sulfur removal by diffusion through polymeric membranes
Assignee: Kovalus Separation Solutions LLC
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Filing: 1969-05-26
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Granted: 1970-10-20
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Expires: 1989-05-26
Abstract
No abstract record available.
Inventors
- 👤 James H Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:59
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/16; C01B17/167; B; B01; B01D; B01D53/00; B01D53/22; C07; C07C; C07C7/00; C07C7/144
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |