US4218504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive recording paper
Assignee: Jujo Paper Co Ltd
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Filing: 1978-12-27
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Granted: 1980-08-19
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Expires: 1998-12-27
Abstract
Abstract A heat-sensitive recording paper containing in its color-developing layer calcined clay or calcined aluminum oxide provides an excellent recording aptitude for a facsimile equipment or thermal printer without producing residues deposition, sticking, bleeding or smearing in recording or printing.
Inventors
- 👤 Noboru Yamato
- 👤 Tosimi Satake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:45
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3377; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
A heat-sensitive recording paper having an excellent recording aptitude for thermal recording equipment containing a phenolic substance and one colorless or thin-colored chromogenic dyestuff selected from the group consisting of lactone, lactam and spiropyrane in the color-developing layer, said color-developing layer containing calcined clay or calcined aluminum oxide.
Claim 2
Dependent Claim
48 words
A heat-sensitive recording paper having an excellent recording aptitude for thermal recording equipment containing a phenolic substance and one colorless or thin-colored chromogenic dyestuff selected from the group consisting of lactone, lactam and spiropyrane in the color-developing layer, said color-developing layer containing calcined clay or calcined aluminum oxide.
Claim 3
Dependent Claim
31 words
A heat-sensitive recording paper according to claim 1, wherein at least 5% by weight of said calcined clay or calcined aluminum oxide is contained in total amount of the fillers thereof.
Claim 4
Dependent Claim
43 words
A heat-sensitive recording paper according to claim 1, wherein said color-developing layer further contains at least one substance to be selected from a group comprising calcium carbonate, kaolin and synthetic aluminum silicate, in addition to said calcined clay or said calcined aluminum oxide.
Claim 5
Dependent Claim
33 words
A heat-sensitive recording paper according to claim 1, wherein said chromogenic dyestuff is at least one substance to be selected from a group comprising crystal violet lactone, 3-diethyamino-6-methyl-7-chlorofluorane, 3-cyclohexylamino-6-chlorofluorane, 3-diethylamino-7-dibenzylaminofluorane, 3-diethyamino-6-methyl-7-anilinofluorane, and 3-pyrrolidino-6-methyl-7-anilinofluorane.
Claim 6
Dependent Claim
35 words
A heat-sensitive recording paper according to claim 1, wherein said phenolic substance is at least one phenolic novolak resin to be selected from a group comprising bisphenol A (4,4-isopropylidenediphenol), p-p' (1-methyl-n-hexylidene) diphenol, p-tert-butylphenol, and p-phenylphenol.
Claim 7
Dependent Claim
49 words
A heat-sensitive recording paper according to claim 1, wherein said color-developing layer contains 1 part of colorless or thin-colored chromogenic dyestuff, 3-10 parts of said phenolic substance, 5-20 parts of said calcined clay or calcined aluminum oxide, and 10-20% by weight of a binder per total solid content 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) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |