Patent US3302643A successfully refreshed from Google Patents.
US3302643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater breathing apparatus
Assignee: Individual
•
Filing: 1964-08-10
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Granted: 1967-02-07
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Expires: 1984-08-10
Abstract
No abstract record available.
Inventors
- 👤 John W Allmand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:16
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
AN UNDERWATER BREATHING APPARATUS COMPRISING A TANK, SAID TANK HAVING A COVER AT EACH END MOUNTED THEREON TO FORM AN AIR CHAMBER, A PISTON SLIDABLY MOUNTED ON SAID TANK, ONE OF SAID COVERS HAVING A PLURALITY OF OPENINGS, A PISTON ROD SECURED AT ONE END TO SAID PISTON SLIDABLY MOUNTED IN ONE OF SAID OPENINGS, A CHARGING MEMBER MOUNTED ON THE FREE END OF SAID PISTON ROD, AN INFLEXIBLE TUBE MOUNTED ON ANOTHER OF SAID OPENING IN SAID ONE OF SAID COVERS, A VALVE MOUNTED ON THE FREE END OF SAID INFLEXIBLE TUBE CONTROLLING THE FLOW OF AIR INTO AND FROM SAID TANK, A FLEXIBLE TUBE SECURED TO ANOTHER OF SAID OPENINGS, A MOUTH PIECE MOUNTED AT THE FREE END OF SAID FLEXIBLE TUBE, AND AT LEAST ONE OPENING IN THE OTHER OF SAID COVERS PERMITTING THE FLOW OF WATER INTO SAID TANK AND AGAINST SAID PISTON, SUBJECTING SAID AIR IN SAID AIR CHAMBER TO THE PRESSURE OF SAID WATER.
Claim 2
Dependent Claim
160 words
AN UNDERWATER BREATHING APPARATUS COMPRISING A TANK, SAID TANK HAVING A COVER AT EACH END MOUNTED THEREON TO FORM AN AIR CHAMBER, A PISTON SLIDABLY MOUNTED ON SAID TANK, ONE OF SAID COVERS HAVING A PLURALITY OF OPENINGS, A PISTON ROD SECURED AT ONE END TO SAID PISTON SLIDABLY MOUNTED IN ONE OF SAID OPENINGS, A CHARGING MEMBER MOUNTED ON THE FREE END OF SAID PISTON ROD, AN INFLEXIBLE TUBE MOUNTED ON ANOTHER OF SAID OPENING IN SAID ONE OF SAID COVERS, A VALVE MOUNTED ON THE FREE END OF SAID INFLEXIBLE TUBE CONTROLLING THE FLOW OF AIR INTO AND FROM SAID TANK, A FLEXIBLE TUBE SECURED TO ANOTHER OF SAID OPENINGS, A MOUTH PIECE MOUNTED AT THE FREE END OF SAID FLEXIBLE TUBE, AND AT LEAST ONE OPENING IN THE OTHER OF SAID COVERS PERMITTING THE FLOW OF WATER INTO SAID TANK AND AGAINST SAID PISTON, SUBJECTING SAID AIR IN SAID AIR CHAMBER TO THE PRESSURE OF SAID WATER.
References Cited (Backward Citations)
US2915059A
Cited
US2906263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |