US2911057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen purifier
Assignee: Engelhard Industries Inc
•
Filing: 1957-07-30
•
Granted: 1959-11-03
•
Expires: 1977-07-30
Abstract
No abstract record available.
Inventors
- 👤 Green Robert Boyce
- 👤 James S Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:30
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C01B3/501; C01B2203/00; C01B2203/04; C01B2203/0405; C01B2203/0465; C01B2203/048; C01B2203/0495
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2536610A
Cited
US2671337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |