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Patent US2717399A successfully refreshed from Google Patents.
US2717399A
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Under-water viewing device
Assignee: Individual
•
Filing: 1952-06-24
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Granted: 1955-09-13
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Expires: 1972-06-24
Abstract
No abstract record available.
Inventors
- 👤 Backhouse Headley Townsend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:25
CPC Classifications
A; A47; A47C; A47C15/00; A47C15/004; A47C15/006; A47C27/00; A47C27/08; A47C27/081; B; B63; B63C; B63C11/00; B63C11/48; B63C11/49
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191406433A
Cited
US1763464A
Cited
US2075649A
Cited
US2068134A
Cited
US2369736A
Cited
US2379526A
Cited
FR987832A
Cited
US2623574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |