Patent US3672750A successfully refreshed from Google Patents.
US3672750A
Expired / Lapsed
US
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Underwater diving mask
Assignee: General Electric Co
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Filing: 1970-07-31
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Granted: 1972-06-27
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Expires: 1990-07-31
Abstract
Abstract AN UNDERWATER DIVING MASK INCLUDING A GENERALLY SPHERICAL LENS PORTION FOR EACH EYE WITH A CORRECTION LENS BEING INCORPORATED INTO EACH LENS PORTION TO PROVIDE IN-FOCUS UNDERWATER VISION FOR PERSONS HAVING NORMAL, FAR-SIGHTED OR NEAR-SIGHTED VISION. THE MASK ALLOWS AS UNDERWATER DIVER TO HAVE VISION SUBSTANTIALLY COMPARABLE TO THAT WHICH HE WOULD HAVE IN AN AIR ENVIRONMENT.
Inventors
- 👤 Kenneth G Hagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:24
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; B63C11/12; G; G02; G02C; G02C7/00; G02C7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |