US3829322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-sensitive phthalide compound copying sheet
Assignee: Fujifilm Holdings Corp
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Filing: 1971-12-23
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Granted: 1974-08-13
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Expires: 1991-12-23
Abstract
Abstract WHEREIN R1, R2, R3, R4, X, Y AND N ARE DESCRIBED HEREINAFTER, IS DISCLOSED. (Y)N-ISOBENZOFURAN-1-ONE 3-(2-X,4-(R1-N(-R2)-)-PHENYL),3-(1-R3,2-R4-INDOL-2-YL), A PRESSURE-SENSITIVE COPYING SHEET COMPRISING AN ADSORBENT SOLID ACID AND A MICROENCAPSULATED COLOR FORMER CAPABLE OF FORMING A DISTINCT COLOR WHEN REACTED WITH SAID ADSORBENT SOLID ACID COATED ON THE SAME OR DIFFERENT SURFACE OF SUPPORT OR SUPPORTS, SAID MICROCAPSULES CONTAINING AN ORGANIC SOLVENT HAVING DISSOLVED THEREIN AS A COLOR FORMER AT LEAST ONE PHTHALIDE COMPOUND REPRESENTED BY THE FOLLOWING FORMULA:
Inventors
- 👤 M Ozutsumi
- 👤 Y Miyazawa
- 👤 K Motohashi
- 👤 M Kiritani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:24
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; C; C09; C09B; C09B11/00; C09B11/04; C09B11/26
Claims Analysis
Total Claims: 0
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |