US3671109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focusing mechanism for catadioptric objective
Assignee: Minolta Co Ltd
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Filing: 1970-06-16
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Granted: 1972-06-20
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Expires: 1990-06-16
Abstract
Abstract AN ADJUSTABLE FOCUS MULTI-REFLECTOR OPTICAL DEVICE SUCH AS OF THE CASSENGRAINIAN OR CATADIOPTRIC TYPE INCLUDES A MAIN BARREL SUPPORTING A STATIONARY FIRST REFLECTOR, AND A SMALLER DIAMETER INTERNALLY THREADED SLEEVE COAXIALLY MOUNTED IN THE MAIN BARREL. AN EXTERNALLY THREADED COLLAR MOUNTING A SECOND EFLECTOR IS LOCATED IN AND ENGAGES THE THREAD IN THE SLEEVE AND A HANDLE EXTENDS RADIALLY FROM THE COLLAR THROUGH A PERIPHERAL SLOT IN THE MAIN BARREL AND IS ROTATABLE WITH THE COLLAR AND CONNECTED THERETO SO AS TO BE RESILIENTLY AXIALLY AND RADIALLY MOVABLE RELATIVE TO THE COLLAR.
Inventors
- 👤 Shigeaki Sugano
- 👤 Kyozo Uesugi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:58
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0856; G02B17/0804; G02B17/0808; G02B17/0852; G02B17/0884; G02B7/00; G02B7/02; G02B7/04
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |