Patent US3558225A successfully refreshed from Google Patents.
US3558225A
Expired / Lapsed
US
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Optical photo opposing apparatus
Assignee: Individual
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Filing: 1968-05-17
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Granted: 1971-01-26
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Expires: 1988-05-17
Abstract
Abstract THE OPTICAL PHOTO OPPOSING APPARATUS CONTAINS A COMPOSITE OBJECTIVE WHICH PRODUCES IMAGE TYPES IN AN ENLARGED OR REDUCED SCALE. A CONSTANT DISTANCE BETWEEN TYPE PLANE AND IMAGE PLANE AND SIMULTANEOUS SHARP FOCUSING WITH IMAGE SIZE VARIATION SIMPLIFIES OPERATION OF THE APPARATUS. THE ENLARGEMENT AND REDUCTION RANGE IS BROADENED BY SWIVELING THE OBJECTIVE THROUGH 180 DEGREES. ADDITIONAL OPTICAL MEANS CAN BE INSERTED INTO AN AIR SPACE IN THE PATH OF RAYS IN THE OBJECTIVE WHEREBY MODIFICATION, ESPECIALLY DISTORTION OR ROTATION OF THE IMAGED TYPES WITH RESPECT TO THE ORIGINAL TYPES, CAN BE OBTAINED.
Inventors
- 👤 Kurt Kirchhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:01
CPC Classifications
B; B41; B41B; B41B13/00
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |