US2543426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator
Assignee: Individual
•
Filing: 1947-10-11
•
Granted: 1951-02-27
•
Expires: 1967-10-11
Abstract
No abstract record available.
Inventors
- 👤 Ferdinand H Terhaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:37
CPC Classifications
A; A61; A61G; A61G11/00; A61H; A61H31/00; A61H31/02; A61G11/005; A61G11/009
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2263844A
Cited
US1900342A
Cited
US1906844A
Cited
US1926069A
Cited
US1933733A
Cited
US1947007A
Cited
US2071215A
Cited
US2243999A
Cited
US2292120A
Cited
US2347326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |