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Patent US3552832A successfully refreshed from Google Patents.
US3552832A
Expired / Lapsed
US
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Optical profile projection systems
Assignee: Rank Organization Ltd
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Filing: 1969-10-27
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Granted: 1971-01-05
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Expires: 1989-10-27
Abstract
Abstract AN OPTICAL PROFILE PROJECTOR HAVING AN AFOCAL OPTICAL OBJECTIVE PROVIDING TELECENTRIC PROJECTION, WHICH COMPRISES FOUR COMPONENTS ARRANGED IN TWO PAIRS SYMMETRICAL WITH RESPECT TO A CENTRAL DIAPHRAGM, THE INNER AND OUTER COMPONENTS OF THE RESPECTIVE PAIRS BEING SIMULTANEOUSLY AND RELATEDLY MOVABLE IN SUCH A MANNER AS TO MAINTAIN THE SYMMETRY OF THE ARRANGEMENT, THE LAWS OF MOVEMENT BEING SUCH AS TO PROVIDE VARIATION OF THE OBJECT PLANE/ IMAGE PLANE DISTANCE WHILST MAINTAINING CONSTANT THE OVERALL MAGNIFICATION OF THE OBJECTIVE, THE LATTER PREFERABLY BEING SIMULTANEOUSLY SUBJECTED TO AN OVERALL MOVEMENT IN ORDER ALSO TO MAINTAIN CONSTANT THE POSITION OF THE IMAGE PLANE.
Inventors
- 👤 David Demaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:32
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/02; G02B15/14; G02B15/142
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |