US3447288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-diffusion assembly including thin hydrogen-permeable impervious foil
Assignee: PROTOTECK Inc
•
Filing: 1965-08-23
•
Granted: 1969-06-03
•
Expires: 1985-08-23
Abstract
No abstract record available.
Inventors
- 👤 Walter Juda
- 👤 Robert Lee Novack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:21
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2457051A
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US2824620A
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GB883760A
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US2958391A
Cited
US3073697A
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GB969673A
Cited
US3241298A
Cited
US3238704A
Cited
US3365785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |