Patent US3029689A successfully refreshed from Google Patents.
US3029689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure metering device
Assignee: Individual
•
Filing: 1959-03-23
•
Granted: 1962-04-17
•
Expires: 1979-03-23
Abstract
No abstract record available.
Inventors
- 👤 Cech Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:04
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1870464A
Cited
US2142657A
Cited
US2243383A
Cited
US2247805A
Cited
US2667809A
Cited
US2841064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-16 | 1965-10-16 | 1966-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-16 | 1969-10-16 | 1970-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-16 | 1973-10-16 | 1974-04-17 | $7700.00 | Window Closed / Lapsed |