Patent US2774346A successfully refreshed from Google Patents.
US2774346A
Expired / Lapsed
US
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Respirator
Assignee: DOROTHY L BISCHOF
•
Filing: 1953-07-13
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Granted: 1956-12-18
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Expires: 1973-07-13
Abstract
No abstract record available.
Inventors
- 👤 Halliburton Erle Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:14
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/10; A61M16/14; A61M16/16; A61M16/08; A61M16/0816; A61M16/0833; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521; Y10T137/2526; Y10T137/7722; Y10T137/7738
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE150950C
Cited
US1583814A
Cited
US2123334A
Cited
US2162898A
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US2420370A
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US2593046A
Cited
US2596178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |