US4520376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive recording sheet
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1983-07-20
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Granted: 1985-05-28
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Expires: 2003-07-20
Abstract
Abstract A heat-sensitive recording sheet consisting of a support and a coating layer comprising microcapsules each containing therein at least a colorless dye precursor as color former, a color developer and a waxy substance being solid at the normal temperature and melting when heated, gives good image retention over a long period of time, has superior chemical resistance and causes no trailing or sticking to a thermal head when recording is made thereon with a heat-sensitive facsimile or a heat-sensitive printer.
Inventors
- 👤 Sadao Morishita
- 👤 Toshihiko Matsushita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:51
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3375; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
A heat-sensitive recording sheet consisting of a support and a coating layer comprising microcapsules which are unbreakable when heated for heat-sensitive recording, said microcapsules each containing therein at least a colorless dye precursor as color former, a color developer and a waxy substance being solid at the normal temperature and melting when heated.
Claim 2
Dependent Claim
53 words
A heat-sensitive recording sheet consisting of a support and a coating layer comprising microcapsules which are unbreakable when heated for heat-sensitive recording, said microcapsules each containing therein at least a colorless dye precursor as color former, a color developer and a waxy substance being solid at the normal temperature and melting when heated.
Claim 3
Dependent Claim
37 words
A heat-sensitive recording sheet according to claim 1, wherein the coating layer comprises at least two kinds of microcapsules each comprising a different colorless dye precursor forming a different color and accordingly can develop a multi color.
Claim 4
Dependent Claim
15 words
A heat-sensitive recording sheet according to claim 2 wherein the microcapsules comprise a melamine-formaldehyde condensate.
Claim 5
Dependent Claim
28 words
A heat-sensitive recording sheet according to claim 1, wherein the ratio of the dye precursor, the color developer and the waxy substance is 1:1 to 10:1 to 10.
Claim 6
Dependent Claim
15 words
A heat-sensitive recording sheet according to claim 4 wherein the microcapsules comprise a melamine-formaldehyde condensate.
Claim 7
Dependent Claim
15 words
A heat-sensitive recording sheet according to claim 1 wherein the microcapsules comprise a melamine-formaldehyde condensate.
References Cited (Backward Citations)
JPS4970B1
Cited
JPS5751490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |