Compact microfilm reader
Abstract
Abstract A MICROFILM READER ADAPTED TO PROJECT SELECTED ZONES OR FRAMES OF A MICROFILM RECORD CONTAINING A GREATLY REDUCED IMAGES OF A LARGE MAP OR OTHER DTA, OR AN ARRAY OF MICROFICHE FRAMES. THE RECORD TO BE PROJECTED IS LAMINATED TO OR PRINTED ON THE TRANSPARENT WINDOW OF A RECTANGULAR CARRIER WHICH IS SHIFTABLE IN X AND Y COORDINATES WITH RESPECT TO THE OPTICAL AXIS OF AN OPTICAL PROJECTION SYSTEM ARRANGED TO CONCENTRATE LIGHT ON A LIMITED ZONE OR FRAME ON THE RECORD. THE CARRIER IS INSERTABLE BETWEEN TWO PINIONS ROTATABLY MOUNTED AT SPACE POSITIONS AT RIGHT ANGLES TO EACH OTHER, THE UPPER PINION ENGAGING RACKS FORMED ON THE TOP FACE OF ONE PAIR OF PARALLEL SIDES OF THE CARRIER, THE LOWER PINION ENGAGING RACKS FORMED ON THE UNDER FACE OF THE OTHER PAIR OF PARALLEL SIDES. INDEXING MEANS ARE PROVIDED TO ROTATE THE PINIONS AND THEREBY INCREMENTALLY SHIFT THE CARRIER TO A POSITION ALIGNING A SELECTED ZONE OR FRAME ON THE RECORD WITH THE OPTICAL SYSTEM.
Inventors
- 👤 Frederick A Burke
- 👤 Robert C Schwartz
Bibliographic Details
Claims Analysis
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |