US2468741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Breathing apparatus
Assignee: Individual
•
Filing: 1944-12-12
•
Granted: 1949-05-03
•
Expires: 1964-12-12
Abstract
No abstract record available.
Inventors
- 👤 John H Emerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:09
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/0003; A61M16/0009
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1044031A
Cited
US1136517A
Cited
US1150508A
Cited
US1214941A
Cited
GB146862A
Cited
DE588091C
Cited
US2273790A
Cited
US2268172A
Cited
US2364626A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-02 | 1952-11-01 | 1953-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-02 | 1956-11-01 | 1957-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-02 | 1960-11-01 | 1961-05-03 | $7700.00 | Window Closed / Lapsed |