Patent US2447450A successfully refreshed from Google Patents.
US2447450A
Expired / Lapsed
US
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Surgical mask
Assignee: GERM EX MASK Co Ltd
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Filing: 1945-12-20
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Granted: 1948-08-17
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Expires: 1965-12-20
Abstract
No abstract record available.
Inventors
- 👤 Spencer R Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:01
CPC Classifications
A; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A41D13/1161
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) | 1951-08-17 | 1952-02-16 | 1952-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-17 | 1956-02-16 | 1956-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-17 | 1960-02-16 | 1960-08-17 | $7700.00 | Window Closed / Lapsed |