Process for producing copies by image-wise heating
Abstract
Abstract THERMOGRAPHIC COPIES ARE MADE WITH MATERIAL, INSENSITIVE TO DAYLIGHT, HAVING A SUPPORT TO WHICH IS ADHERED A COPYING LAYER OF A SWELLABLE BINDER WHICH CAN BE HARDENED TO REDUCE THIS SWELLABILITY. DISPERSED IN THE BINDER IS A HARDENER THAT EFFECTS SUCH HARDENING WHEN HEATED TO 50-300*C. AND THE BINDER IS COLORED SO THAT IT ABSORBS LIGHT AND CONVERTS THE LIGHT ENERGY TO HEAT ENERGY. WHEN EXPOSED TO AN ORIGINAL IMAGE WITH A HIGH INTENSITY FLASH OF AT LEAST 300 WATT-SECONDS, THE EXPOSED PORTIONS OF THE BINDER BECOME HARDENED LEAVING THE OTHER PORTIONS SWELLABLE. A SWELLING LIQUID IS THEN APPLIED AND THE COPYING LAYER PLACED AGAINST A RECEIVING SHEET. THE SWELLED UNEXPOSED PORTIONS OF THE COPYING LAYER ADHERE TO THE RECEIVING SHEET AND WHEN THE RECEIVING SHEET IS PULLED AWAY FROM THE COPYING LAYER, A RELIEF IMAGE OF THE ORIGINAL IS TORN OUT OF THE COPYING LAYER AND APPEARS ON THE RECEIVING SHEET. AT THE SAME TIME A RELIEF IMAGE OF OPPOSITE SENSE REMAINS ON THE COPYING LAYER.
Inventors
- 👤 Alexander Riebel
- 👤 Wolfgang Lassing
- 👤 Karl Dinges
- 👤 Wolfgang Himmelmann
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |