Pressure sensitive copying paper
Abstract
Abstract PRESSURE-SENSITIVE COPYING PAPER AND PROCESS FOR PREPARING SAME COMPRISING A SUPPORT HAVING COATED THEREON A LAYER OF A COLOR-FORMING COMPOUND HAVING THE FORMULA 3-R1,R2,R3-SPIRO(BENZOTHIAZOLINE-2,2''-(2H-1,3)BENZOXAZINE) WHEREIN R1 IS AN ALKYL GROUP HAVING 1 TO 4 CARBON ATOMS, R2 AND R3 EACH IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF A HYDROGEN ATOM, A HALOGEN ATOM, A NITRO GROUP, AN ALKOXYL GROUP OF FROM 1 TO 4 CARBON ATOMS, AN ALKOXYCARBONYL GROUP OF FROM 1 TO 4 CARBON ATOMS, AND AN ALDEHYDE GROUP, SAID COMPOUND REACTIVE WITH AN ELECTRON ACCEPTIVE SUBSTANCE TO PRODUCE A DISTINCT COLOR. THE PRESENT INVENTION ALSO EXTENDS TO THE COLOR-FORMING COMPOUNDS EMPLOYED AND THEIR PROCESS OF PREPARATION.
Inventors
- 👤 Hisatake Ono
- 👤 Chiaki Osada
Bibliographic Details
Claims Analysis
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |