US4641160A
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Recording system utilizing phthalide derivatives as colorless chromogenic material
Assignee: New Oji Paper Co Ltd
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Filing: 1984-11-02
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Granted: 1987-02-03
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Expires: 2004-11-02
Abstract
Abstract A new phthalide derivative useful as a colorless chromogenic material has the general formula: <IMAGE> or <IMAGE> wherein R1 to R10, X1, X2, Y1, Y2, Z, a and b have the same meaning as defined hereinbefore.
Inventors
- 👤 Mitsuru Kondo
- 👤 Tomoyuki Okimoto
- 👤 Nobuo Kanda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:18
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/88; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; B41M5/26; B41M5/30; B41M5/323; B41M5/327
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A heat-sensitive record material which comprises: (a) a heat-sensitive recording layer including a colorless chromogenic material; and (b) an electron accepting acidic reactant material on a base sheet, said colorless chromogenic material being at least one phthalide compound having the formula: ##STR80## wherein R 1 is chlorine or bromine; each X and Y is hydrogen, alkyl having 1 or 2 carbon atoms, or alkoxyl having 1 or 2 carbon atoms; and a is an integer of 4 to 6, but when both X and Y are hydrogen, a is 6.
Claim 2
Dependent Claim
90 words
A heat-sensitive record material which comprises: (a) a heat-sensitive recording layer including a colorless chromogenic material; and (b) an electron accepting acidic reactant material on a base sheet, said colorless chromogenic material being at least one phthalide compound having the formula: ##STR80## wherein R 1 is chlorine or bromine; each X and Y is hydrogen, alkyl having 1 or 2 carbon atoms, or alkoxyl having 1 or 2 carbon atoms; and a is an integer of 4 to 6, but when both X and Y are hydrogen, a is 6.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |