US2687741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator unit
Assignee: O E M Corp
•
Filing: 1951-12-28
•
Granted: 1954-08-31
•
Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 Robert J Reading
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:47
CPC Classifications
A; A61; A61G; A61G10/00; A61G10/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2567; Y10T137/2569
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US804272A
Cited
US1539630A
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US1753662A
Cited
US1979981A
Cited
US2197144A
Cited
US2463090A
Cited
US2600493A
Cited
US2617414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |