Patent US4003589A successfully refreshed from Google Patents.
US4003589A
Expired / Lapsed
US
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Carbonless copying paper
Assignee: Kureha Corp
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Filing: 1973-10-04
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Granted: 1977-01-18
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Expires: 1993-10-04
Abstract
Abstract Carbonless copying paper comprising paper coated with microcapsules containing a dye solution which is composed of a solvent, a dye which gives color under acidic conditions and a mineral oil, said dye solution including as solvent one or more of alkylnaphthalenes of the general formula ##STR1## WHEREIN R represents C 1 -C 4 alkyl group, n is an integer of 1-4, and R may be the same or different when n is 2-4, the total number of carbon atoms in R's being 4-6. Such carbonless copying papers exhibit excellent color development and are non-toxic and biodegradable, thus causing no environmental pollution when they are discarded.
Inventors
- 👤 Akio Konishi
- 👤 Masaaki Takahashi
- 👤 Fumihiro Kimura
- 👤 Takehisa Toguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:18
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/025; B41; B41M; B41M5/00; B41M5/124; B41M5/165; B41M5/1655; Y; Y10; Y10S; Y10S428/00; Y10S428/914
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
In a carbonless copying paper comprising paper coated with microcapsules containing a dye solution which is composed of a solvent, a dye and a mineral oil, the improvement comprising a dye solution including: a. 100 parts of solvent comprising one or more alkyl naphthalenes selected from the group consisting of methyl propyl naphthalene, dimethyl propyl naphthalene and dipropyl naphthalene; b. 0.5-15 parts of a dye which gives color under acidic conditions; and c. 0-100 parts of mineral oil.
Claim 2
Dependent Claim
78 words
In a carbonless copying paper comprising paper coated with microcapsules containing a dye solution which is composed of a solvent, a dye and a mineral oil, the improvement comprising a dye solution including: a. 100 parts of solvent comprising one or more alkyl naphthalenes selected from the group consisting of methyl propyl naphthalene, dimethyl propyl naphthalene and dipropyl naphthalene; b. 0.5-15 parts of a dye which gives color under acidic conditions; and c. 0-100 parts of mineral oil.
Claim 3
Dependent Claim
58 words
In a carbonless copying paper comprising paper coated with microcapsules containing a dye solution which is composed of a solvent, a dye and a mineral oil, the improvement comprising a dye solution including: a. 100 parts of diethyl naphthalene; b. 0.5-15 parts of a dye which gives color under acidic conditions; and c. 0-100 parts of mineral oil.
Claim 4
Dependent Claim
58 words
In a carbonless copying paper comprising paper coated with microcapsules containing a dye solution which is composed of a solvent, a dye and a mineral oil, the improvement comprising a dye solution including: a. 100 parts of diethyl naphthalene; b. 0.5-15 parts of a dye which gives color under acidic conditions; and c. 0-100 parts of mineral oil.
Claim 5
Dependent Claim
58 words
In a carbonless copying paper comprising paper coated with microcapsules containing a dye solution which is composed of a solvent, a dye and a mineral oil, the improvement comprising a dye solution including: a. 100 parts of butyl naphthalene; b. 0.5-15 parts of a dye which gives color under acidic conditions; and c. 0-100 parts of mineral oil.
Claim 6
Dependent Claim
58 words
In a carbonless copying paper comprising paper coated with microcapsules containing a dye solution which is composed of a solvent, a dye and a mineral oil, the improvement comprising a dye solution including: a. 100 parts of butyl naphthalene; b. 0.5-15 parts of a dye which gives color under acidic conditions; and c. 0-100 parts of mineral oil.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |