US2983573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of hydrogen sulphide from gases
Assignee: Dempster Robert and Sons Ltd
•
Filing: 1956-06-25
•
Granted: 1961-05-09
•
Expires: 1976-06-25
Abstract
No abstract record available.
Inventors
- 👤 David B Moore
- 👤 Patrick S L Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:08
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/08; B01J8/12; C; C10; C10K; C10K1/00; C10K1/20; C10K1/30
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) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |