US3396725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator with negative pressure limiting valve
Assignee: Individual
•
Filing: 1965-01-11
•
Granted: 1968-08-13
•
Expires: 1985-01-11
Abstract
No abstract record available.
Inventors
- 👤 Schreiber Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:42
CPC Classifications
A; A61; A61M; A61M16/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2121311A
Cited
USRE24193E
Cited
US2693180A
Cited
US2766753A
Cited
US2944544A
Cited
US3039481A
Cited
US3071131A
Cited
US3158152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |