US3021774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depth-of-focus indicator for photographic instruments
Assignee: Jos Schneider Optische Werke GmbH
•
Filing: 1959-04-10
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Granted: 1962-02-20
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Expires: 1979-04-10
Abstract
No abstract record available.
Inventors
- 👤 Ewald Waldemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:57
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2536500A
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US1329729A
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US1650704A
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US2315977A
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US2527106A
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US2541469A
Cited
CH300619A
Cited
US2914998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |