US3513843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respiratory device for rebreathing carbon dioxide
Assignee: Individual
•
Filing: 1967-07-07
•
Granted: 1970-05-26
•
Expires: 1987-07-07
Abstract
No abstract record available.
Inventors
- 👤 Gertrude Exler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:08
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/0045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189318777A
Cited
US733027A
Cited
GB191218492A
Cited
FR689788A
Cited
US2007330A
Cited
US2241535A
Cited
US2321256A
Cited
US3028873A
Cited
US2893387A
Cited
US3395699A
Cited
US3366108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |