Patent US3701587A successfully refreshed from Google Patents.
US3701587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image focusing lens system for copying machines
Assignee: Konica Minolta Inc
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Filing: 1971-05-19
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Granted: 1972-10-31
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Expires: 1991-05-19
Abstract
Abstract A NEW SYSTEM FOR COPYING MACHINES, INCLUDING AN IMAGE FOCUSING LENS SYSTEM IS NOW PROPOSED. THE SAID IMAGE FOCUSING LENS SYSTEM WHICH IS THE SUBJECT MATTER OF THE PRESENT APPLICATION HAS A BRIGHT F NUMBER AS LARGE AS ABOUT 4 AND IS WELL COMPENSATED IN ABERRATION. THE IMAGE FOCUSING LENS SYSTEM INCORPORATES A SUBSTANTIALLY SYMMETRICAL IMAGE FOCUSING LENS CONSTRUCTION OR A SYMMETRICAL HALF OF THE FOCUSING LENS CONSTRUCTION WITH THE ADDITION OF A PLANE MIRROR, ROOF MIRROR OR ROOF PRISM (DACH PRISM) DISPOSED BEHIND THE SYMMETRICAL LENS HALF.
Inventors
- 👤 Tadashi Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:28
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |