US3486301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen diffusion apparatus
Assignee: Engelhard Minerals and Chemicals Corp
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Filing: 1968-08-05
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Granted: 1969-12-30
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Expires: 1988-08-05
Abstract
No abstract record available.
Inventors
- 👤 Robert E Bonnet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:29
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/22; B01D63/00; B01D63/08; C; C01; C01B; C01B3/00; C01B3/50; C01B3/501; B01D2313/00; B01D2313/16; B01D2313/18; C01B2203/00; C01B2203/04; C01B2203/0405; 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) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |