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US3493764A
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Automatic focusing apparatus using a diffusing element
Assignee: Logetronics Inc
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Filing: 1967-11-09
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Granted: 1970-02-03
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Expires: 1987-11-09
Abstract
No abstract record available.
Inventors
- 👤 Dwin R Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:01
CPC Classifications
G; G03; G03B; G03B3/00; G03B3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1794222A
Cited
US2286471A
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US2831057A
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US2818775A
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US3041459A
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US3035176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |