Patent US3467462A successfully refreshed from Google Patents.
US3467462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens system of low chromatic aberration
Assignee: Pentax Corp
•
Filing: 1965-07-09
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Granted: 1969-09-16
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Expires: 1985-07-09
Abstract
No abstract record available.
Inventors
- 👤 Tomokazu Kazamaki
- 👤 Tohru Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:06
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2487873A
Cited
US3320016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-15 | 1973-03-17 | 1973-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-15 | 1977-03-17 | 1977-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-15 | 1981-03-17 | 1981-09-16 | $7700.00 | Window Closed / Lapsed |