US3365859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for concentrating hydrogen
Assignee: Universal Oil Products Co
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Filing: 1966-11-04
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Granted: 1968-01-30
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Expires: 1986-11-04
Abstract
No abstract record available.
Inventors
- 👤 William A Sandberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:26
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C01B3/56; B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; C01B3/52; B01D2253/00; B01D2253/10; B01D2253/102; B01D2256/00; B01D2256/16; B01D2257/00; B01D2257/70; B01D2257/702; B01D2259/00; B01D2259/40; B01D2259/403; C01B2203/00; C01B2203/04; C01B2203/0415; C01B2203/0465; C01B2203/048
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) | 1971-01-29 | 1971-07-31 | 1972-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-29 | 1975-07-31 | 1976-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-29 | 1979-07-31 | 1980-01-30 | $7700.00 | Window Closed / Lapsed |