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Patent US2674156A successfully refreshed from Google Patents.
US2674156A
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Arrangement and method for viewing a pair of polarized images to eliminate ghosts
Assignee: American Optical Corp
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Filing: 1950-04-12
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Granted: 1954-04-06
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Expires: 1970-04-12
Abstract
No abstract record available.
Inventors
- 👤 Mahler Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:41
CPC Classifications
G; G03; G03B; G03B35/00; G03B35/18; G03B35/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1879793A
Cited
US1885642A
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US2206303A
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US2165974A
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US2281101A
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US2289714A
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US2458437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |