Patent US3873340A successfully refreshed from Google Patents.
US3873340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-sensitive copying paper containing phenoxazine compounds
Assignee: Hodogaya Chemical Co Ltd
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Filing: 1972-07-27
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Granted: 1975-03-25
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Expires: 1992-07-27
Abstract
Abstract A pressure-sensitive copying paper comprising an adsorbent solid acid and a microencapsulated color former capable of forming a distinct color when reacted with the adsorbent acid coated on the same or a different surface of a support or supports, the microencapsulated color former being at least one phenoxazine compound represented by the formula WHEREIN R1, R2, R3, R4 and Y are as defined hereinafter, is disclosed.
Inventors
- 👤 Yoshihide Miyazawa
- 👤 Minoru Ozutsumi
- 👤 Katsuichi Motohashi
- 👤 Shiro Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:03
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; C; C09; C09B; C09B19/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
41 words
A PRESSURE-SENSITIVE COPYING PAPER COMPRISING ON A SUPPORT A LAYER OF AN ENCAPSULATED COLOR FORMER AND ON THE SAME OR A DIFFERENT SUPPORT A LAYER OF AN ELECTRON ACCEPTING SOLID, SAID COLOR FORMER BEING A PHENOXAZINE COMPOUND REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
41 words
A PRESSURE-SENSITIVE COPYING PAPER COMPRISING ON A SUPPORT A LAYER OF AN ENCAPSULATED COLOR FORMER AND ON THE SAME OR A DIFFERENT SUPPORT A LAYER OF AN ELECTRON ACCEPTING SOLID, SAID COLOR FORMER BEING A PHENOXAZINE COMPOUND REPRESENTED BY THE FORMULA
Claim 3
Dependent Claim
49 words
The pressure-sensitive copying paper according to claim 1, wherein said color former is a compound selected from the group consisting of 3,7-bis(diethylamino)-10-acetylphenoxazine, 3,7-bis(diethylamino)-10-crotonoylphenoxazine, 3,7-bis(diethylamino)-10-cinnamoylphenoxazine, 3,7-bis(diethylamino0-10-(p-nitrophenylacetyl)-phenoxazine, 3,7-bis(diethylamino)-10-(p-chlorophenoxyacetyl)-phenoxazine, 3,7 -bis(diethylamino)-10-benzoylphenoxazine, 3,7-bis(diethylamino)-10-(p-methylbenzoyl)-phenoxazine, 3,7-bis(diethylamino)-10-(p-methoxybenzoyl)-phenoxazine, 3,7-bis(diethylamino)-10-(p-dimethylaminobenzoyl)-phenoxazine, 3,7-bis(diethylamino)-10-(o-hydroxybenzoyl)-phenoxazine, 3,7-bis(diethylamino)-10-(p-nitrobenzoyl)-phenoxazine, 3,7-bis(diethylamino)-10-(2-furoyl)-phenoxazine, 3, 7-bis(diethylamino)-10-(2-thienoyl)-phenoxazine, 3,7-bis(diethylamino-10-nicotinoylphenoxazine, 3,7-bis(diethylamino)-10-isonicotinoylphenoxazine, 3,7-bis(diethylamino)-10-(2-phenylcinchonoyl)-phenoxazine, 3-diethylamino-7-dimethylamino-8-methyl-10-(p-methylbenzoyl)-phenoxazine, 3-diethylamino-7-dimethylamino-8-methyl-10-(1-naphthoyl)-phenoxazine, 3-diethylamino-7-dimethylamino-8-methyl-10-(3-hydroxy-2-naphthoyl) -phenoxazine, 3-diethylamino-7-di-n-butylamino-10-(p-methoxybenzoyl)-phenoxazine, 3-(N-methyl-N-phenylamino)-7-diethylamino-10-(p-methoxybenzoyl)-phenoxazine and a mixture thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |