US3458412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic process of preparing pure hydrogen
Assignee: Panasonic Holdings Corp
•
Filing: 1967-03-15
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Granted: 1969-07-29
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Expires: 1987-03-15
Abstract
No abstract record available.
Inventors
- 👤 Mutsuaki Shinagawa
- 👤 Hiroyuki Nezu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:52
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/02; C25B1/04; C25B11/00; C25B11/04; C25B11/042; C25B15/00; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB303027A
Cited
US2433871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |