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US2540567A
Expired / Lapsed
US
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Respiratory facial mask
Assignee: Individual
•
Filing: 1948-05-03
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Granted: 1951-02-06
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Expires: 1968-05-03
Abstract
No abstract record available.
Inventors
- 👤 Bennett V Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:06
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/06; A61M16/0605; A61M16/0616; A61M16/0622; A62; A62B; A62B18/00; A62B18/02; A62B18/025; A62B18/08; A62B18/086; A61M16/0683
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB458403A
Cited
US2254854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |