US2909119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen gas generator
Assignee: Individual
•
Filing: 1955-07-15
•
Granted: 1959-10-20
•
Expires: 1975-07-15
Abstract
No abstract record available.
Inventors
- 👤 Ralph P Crist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:45
CPC Classifications
B; B01; B01J; B01J7/00; B01J7/02; F; F42; F42B; F42B22/00; F42B22/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US627795A
Cited
GB191424821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |