US2936689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Close-up attachment for photographic cameras
Assignee: Individual
•
Filing: 1956-05-01
•
Granted: 1960-05-17
•
Expires: 1976-05-01
Abstract
No abstract record available.
Inventors
- 👤 Kirchhoff Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:29
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/02; G03B17/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1993463A
Cited
DE600742C
Cited
US1979159A
Cited
GB509424A
Cited
FR849485A
Cited
US2674932A
Cited
FR967370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |