US3277890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed cycle respirator
Assignee: Individual
•
Filing: 1964-02-17
•
Granted: 1966-10-11
•
Expires: 1984-02-17
Abstract
No abstract record available.
Inventors
- 👤 Warncke Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:15
CPC Classifications
A; A62; A62B; A62B25/00; A62B7/00; A62B7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN A RESPIRATOR HAVING AN OXYGEN GENERATING CARTRIDGE THROUGH WHICH FLOWS THE EXHALED AIR OF THE USER OF THE RESPIRATOR, A BREATHING TUBE AND MOUTHPIECE COMMUNICATING WITH ONE END OF SAID CARTRIDGE, AND A BREATHING BAG COMMUNICATING WITH THE OPPOSITE END OF SAID CARTRIDGE, THE IMPROVEMENT COMPRISING A DUCT EXTENDING THROUGH SAID CARTRIDGE BETWEEN SAID TUBE AND BAG AND FORMING A PART OF SAID CARTRIDGE, A CASING ENCLOSING SAID CARTRIDGE, A VALVE CAGE MOVABLY MOUNTED IN SAID DUCT, A CHECK VALVE IN SAID VALVE CAGE AND OPERABLE IN THE DIRECTION OF AIR INHALED BY THE USER OF THE RESPIRATOR, SAID BREATHING TUBE BEING ATTACHED TO SAID VALVE CAGE, A FLANGE SURROUNDING THE AIR INLET OF SAID DUCT, SAID BREATHING BAG BEING FASTENED TO SAID FLANGE, AIR PORTS IN THE AIR INLET END OF
Claim 2
Dependent Claim
133 words
IN A RESPIRATOR HAVING AN OXYGEN GENERATING CARTRIDGE THROUGH WHICH FLOWS THE EXHALED AIR OF THE USER OF THE RESPIRATOR, A BREATHING TUBE AND MOUTHPIECE COMMUNICATING WITH ONE END OF SAID CARTRIDGE, AND A BREATHING BAG COMMUNICATING WITH THE OPPOSITE END OF SAID CARTRIDGE, THE IMPROVEMENT COMPRISING A DUCT EXTENDING THROUGH SAID CARTRIDGE BETWEEN SAID TUBE AND BAG AND FORMING A PART OF SAID CARTRIDGE, A CASING ENCLOSING SAID CARTRIDGE, A VALVE CAGE MOVABLY MOUNTED IN SAID DUCT, A CHECK VALVE IN SAID VALVE CAGE AND OPERABLE IN THE DIRECTION OF AIR INHALED BY THE USER OF THE RESPIRATOR, SAID BREATHING TUBE BEING ATTACHED TO SAID VALVE CAGE, A FLANGE SURROUNDING THE AIR INLET OF SAID DUCT, SAID BREATHING BAG BEING FASTENED TO SAID FLANGE, AIR PORTS IN THE AIR INLET END OF
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |