US3558220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viewing head for periscopes
Assignee: Carl Zeiss AG
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Filing: 1964-04-06
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Granted: 1971-01-26
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Expires: 1984-04-06
Abstract
Abstract 1. A VIEWING HEAD FOR A PERISCOPE HAVING A HOOD COMPRISING A PLURALITY OF GLASS BODIES DIRECTLY CEMENTED TOGETHER, SAID HOOD HAVING AN INNER SURFACE FORMED BY A NUMBER OF PLANE FACES ARRANGED AT DIFFERENT INCLINATIONS TO EACH OTHER, SAID HOOD ALSO HAVING AN OUTER SURFACE FORMED BY THE SAME NUMBER OF PLANE FACES AS SAID INNER SURFACE, EACH ONE OF OUTER PLANE FACES BEING PARALLEL TO AN ASSOCIATED INNER PLANE FACE OF SAID INNER SURFACE.
Inventors
- 👤 Walter Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:05
CPC Classifications
B; B63; B63G; B63G8/00; B63G8/38; G; G02; G02B; G02B23/00; G02B23/02; G02B23/08
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |