US2838978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four lens photographic objective
Assignee: Canon Inc
•
Filing: 1956-05-23
•
Granted: 1958-06-17
•
Expires: 1976-05-23
Abstract
No abstract record available.
Inventors
- 👤 Mukai Jiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:59
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US721240A
Cited
US2158178A
Cited
GB609669A
Cited
GB706605A
Cited
FR1057720A
Cited
US2732762A
Cited
FR1120790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |