Patent US2743646A successfully refreshed from Google Patents.
US2743646A
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Optical instrument having throughand-return light path
Assignee: Individual
•
Filing: 1952-05-17
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Granted: 1956-05-01
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Expires: 1972-05-17
Abstract
No abstract record available.
Inventors
- 👤 John D Strong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:51
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2212211A
Cited
US2378930A
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US2503165A
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US2451572A
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US2462946A
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US2605671A
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US2562181A
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US2652742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |