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Patent US3028859A successfully refreshed from Google Patents.
US3028859A
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Underwater breathing device
Assignee: Dacor Corp
•
Filing: 1955-09-15
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Granted: 1962-04-10
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Expires: 1975-09-15
Abstract
No abstract record available.
Inventors
- 👤 Wallace F Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:38
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22; B63C11/2236; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1328057A
Cited
GB145296A
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US1625419A
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FR942351A
Cited
US2596178A
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US2608971A
Cited
US2732840A
Cited
US2823670A
Cited
US2920637A
Cited
US2757680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |