Heat sensitive copying sheet
Abstract
Abstract HEAT SENSITIVE COPYING PAPERS USING A SPIRO COMPOUND HAVING THE FORMULA A 2-R1,2''-R2-3,3''-SPIROBI(3H-NAPHTHO(2,1-B)PYRAN WHEREIN R1 AND R2 EACH IS SELECTED FROM THE GROUP CONSISTING OF A HYDROGEN ATOM, AN ALKYL GROUP HAVING FROM 1 TO 8 CARBON ATOMS, A CARBOXYLIC ACID ESTER, AN ARALKYL GROUP AND A PHENYL GROUP, A SOLID ORGANIC SULFONIC ACID HAVING THE FORMULA R-SO3H (B) WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF AN AMINO GROUP, AN N-SUBSTITUTED AMINO ALKYL GROUP HAVING FROM 2 TO 18 CARBON ATOMS, AN UNSUBSTITUTED AMINO ALKYL GROUP HAVING FROM 2 TO 18 CARBON ATOMS, AN ALKYL GROUP HAVING FROM 10 TO 20 CARBON ATOMS, AN ALKOXY GROUP HAVING FROM 10 TO 20 CARBON ATOMS, A CARBOXYLIC ACID SUBSTITUTED ALKYL GROUP, SAID ALKYL GROUP HAVING FROM 6 TO 18 CARBON ATOMS, AND AN AROMATIC RING, AND A THERMOFUSIBLE MATERIAL HAVING A MELTING POINT RANGING FROM 50 TO 180*C. ARE DISCLOSED.
Inventors
- 👤 Shiro Kimura
- 👤 Sadao Ishige
- 👤 Teruo Kobayashi
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |