Patent US3519361A successfully refreshed from Google Patents.
US3519361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light measuring system
Assignee: Pentax Corp
•
Filing: 1968-06-12
•
Granted: 1970-07-07
•
Expires: 1988-06-12
Abstract
No abstract record available.
Inventors
- 👤 Tsuneo Hidaka
- 👤 Koichiro Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:07
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/16; G01J1/1626; G03; G03B; G03B7/00; G03B7/08; G03B7/099; G03B7/0993; G03B7/0997; G03B7/09971; G03B7/09976
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
CH398295A
Cited
CH415101A
Cited
US3446562A
Cited
US3401614A
Cited
US3429246A
Cited
US3378285A
Cited
US3465660A
Cited
US3464339A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |