US3539499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for hydrogen deentraining
Assignee: HRI Inc
•
Filing: 1967-08-01
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Granted: 1970-11-10
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Expires: 1987-08-01
Abstract
No abstract record available.
Inventors
- 👤 Michael C Chervenak
- 👤 Ronald H Wolk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:59
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/20; B01J8/22; C; C10; C10G; C10G45/00; C10G45/02; C10G45/14; C10G45/16
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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |