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US3435794A
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Removable two-way pressure door assembly
Assignee: Hahn and Clay
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Filing: 1967-06-06
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Granted: 1969-04-01
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Expires: 1987-06-06
Abstract
No abstract record available.
Inventors
- 👤 Raymond E Pechacek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:04
CPC Classifications
B; B63; B63G; B63G8/00; B63G8/04; B01; B01J; B01J3/00; B01J3/03; B63C; B63C11/00; B63C11/34; B63C11/44; F; F16; F16J; F16J13/00; F16J13/02; F16J13/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US320971A
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US1560489A
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US1858013A
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US2373480A
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US2926012A
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US3155116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |