US3490831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflector lens system
Assignee: Pentax Corp
•
Filing: 1967-01-24
•
Granted: 1970-01-20
•
Expires: 1987-01-24
Abstract
No abstract record available.
Inventors
- 👤 Yasuo Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:07
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0856; G02B17/0804; G02B17/0808; G02B17/0852; G02B17/0884
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
5F$A$0.2F 0.3F$B$0.15F F/5$F1,2,3$F/2 F/1.8$F1,2,3,(2),4,(2)$F/1.0 1.0<$RL$/$R10$<2.5
References Cited (Backward Citations)
US2730013A
Cited
US2726574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |