US3475302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic hydrogen purification and recovery of same
Assignee: Wyeth Holdings LLC
•
Filing: 1967-08-07
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Granted: 1969-10-28
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Expires: 1987-08-07
Abstract
No abstract record available.
Inventors
- 👤 Stanley Harold Langer
- 👤 Robert George Haldeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:39
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C25; C25B; C25B1/00; C25B1/01; C25B1/02; C01B2203/00; C01B2203/04; C01B2203/0465; C01B2203/047; C01B2203/048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US409366A
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US3103473A
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US2384463A
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US2928891A
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US3124520A
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US3134697A
Cited
US3092516A
Cited
US3180762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |