US4070303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent for dye used in pressure-sensitive copying paper
Assignee: Kureha Corp
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Filing: 1976-04-26
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Granted: 1978-01-24
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Expires: 1996-04-26
Abstract
Abstract Disclosed is a composition used as a solvent for dye used in pressure-sensitive copying paper containing an aromatic solvent and an aliphatic di-ester of the formula ROOC (CH 2 ) COOR wherein R is methyl or ethyl and n is 2-4.
Inventors
- 👤 Kimio Ohkubo
- 👤 Mikio Fujioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:27
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/165; B41M5/1655; C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0083; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A solvent for dye used in pressure-sensitive copying paper, comprising (a) an aromatic hydrocarbon selected from the group consisting of alkyl naphthalenes, alkyl biphenyls, triaryl dimethanes, diaryl ethanes and hydrogenated terphenyls and mixtures thereof and (b) an aliphatic acid di-ester of the formula ROOC--CH.sub.2n --COOR Wherein R is methyl or ethyl and n is an integer from 2 to 4, said di-ester being present in an amount of 0.5 to 10 parts by weight per 100 parts by weight of said aromatic hydrocarbon.
Claim 2
Dependent Claim
83 words
A solvent for dye used in pressure-sensitive copying paper, comprising (a) an aromatic hydrocarbon selected from the group consisting of alkyl naphthalenes, alkyl biphenyls, triaryl dimethanes, diaryl ethanes and hydrogenated terphenyls and mixtures thereof and (b) an aliphatic acid di-ester of the formula ROOC--CH.sub.2n --COOR Wherein R is methyl or ethyl and n is an integer from 2 to 4, said di-ester being present in an amount of 0.5 to 10 parts by weight per 100 parts by weight of said aromatic hydrocarbon.
Claim 3
Dependent Claim
26 words
The solvent according to claim 1, wherein said di-ester of aliphatic acid is dimethyl succinate, diethyl succinate, dimethyl glutarate, diethyl glutarate, dimethyl adipate or dieethyl adipate.
Claim 4
Dependent Claim
13 words
The solvent according to claim 1, wherein said aromatic hydrocarbon is dipropyl naphthalene.
Claim 5
Dependent Claim
11 words
The solvent according to claim 1, wherein said biphenyl is isopropyl.
Claim 6
Dependent Claim
13 words
The solvent according to claim 1, wherein said aromatic hydrocarbon is dibenzyl toluene.
Claim 7
Dependent Claim
14 words
The solvent according to claim 1, wherein said aromatic hydrocarbon is phenyl xylyl ethane.
References Cited (Backward Citations)
US3016308A
Cited
US3846331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |