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US2928387A
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US
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Quick donning mask assembly
Assignee: Sierra Engineering Co
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Filing: 1958-09-08
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Granted: 1960-03-15
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Expires: 1978-09-08
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Layne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:13
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/08; A62B18/084; A61; A61M; A61M16/00; A61M16/06; A61M16/0605; A61M16/0683; A61M16/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2353643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |