US3736168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-sensitive phthalide compound copying papers
Assignee: Fujifilm Holdings Corp
•
Filing: 1971-05-17
•
Granted: 1973-05-29
•
Expires: 1991-05-17
Abstract
Abstract A PRESSURE-SENSITIVE TRANSFERRING SHEET, ADAPTED FOR USE WITH ANOTHER SHEET HAVING AN ELECTRON ACCEPTING LAYER, COMPRISING A SUPPORT HAVING THEREON A PRESSURE-RUPTURABLE MICROCAPSULE LAYER, SAID MICROCAPSULE CONTAINING AN OIL HAVING DISSOLVED THEREIN AS A COLOR FORMER AT LEAST ONE PHTHALIDE COMPOUND REPRESENTED BY THE FOLLOWING GENERAL FORMULA 1-(4-(R1-N(-R2)-)PHENYL),1-(1-R3,2-R4-INDOL-3-YL),3-(O=), 4-X1,5-X2,6-X3,7-X4-PHTHALAN WHEREIN X1, X2, X3, X4, R1, R2, R3 AND R4 ARE DESCRIBED HEREINAFTER, IS DISCLOSED.
Inventors
- 👤 M Ozutsumi
- 👤 Y Miyazawa
- 👤 K Motohashi
- 👤 S Ogawa
- 👤 S Mishima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:54
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/31504; Y10T428/31844
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |