US4490732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive recording sheets
Assignee: Fujifilm Holdings Corp
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Filing: 1982-10-22
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Granted: 1984-12-25
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Expires: 2002-10-22
Abstract
Abstract A heat-sensitive recording sheet is disclosed. The sheet comprises a base paper and a heat-sensitive color forming layer on the base paper, wherein the base paper has a density of 0.9 g/cm 3 or less and its surface on which the heat-sensitive color forming layer is to be coated has an optical contact ratio of at least 15%.
Inventors
- 👤 Masakazu Maekawa
- 👤 Yasuhiro Ogata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:09
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/41; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
46 words
A heat-sensitive recording sheet, comprising: a base paper having a density of 0.9 g/cm 3 or less; and a heat-sensitive color forming layer coated on the surface of the base paper, the optical contact ratio of the surface of the base paper being at least 15%.
Claim 2
Dependent Claim
46 words
A heat-sensitive recording sheet, comprising: a base paper having a density of 0.9 g/cm 3 or less; and a heat-sensitive color forming layer coated on the surface of the base paper, the optical contact ratio of the surface of the base paper being at least 15%.
Claim 3
Dependent Claim
44 words
A heat-sensitive recording sheet as claimed in claim 1, wherein the base paper is produced by drying a wet web having a water content of 50 to 70% to a water content of 15% or less by pressing the paper onto a Yankee dryer.
Claim 4
Dependent Claim
25 words
A heat-sensitive recording sheet as claimed in any of claims 1 or 2, wherein the base paper has a void content of 40% or more.
Claim 5
Dependent Claim
34 words
A heat-sensitive recording sheet as claimed in any of claims 1 or 2, wherein the heat-sensitive color forming layer is comprised of dispersed particles having a volume-average particle size of 8 μm or less.
Claim 6
Dependent Claim
22 words
A heat-sensitive recording sheet as claimed in claim 4, wherein the particles have a volume-average particle size of 4 μm or less.
Claim 7
Dependent Claim
24 words
A heat-sensitive recording sheet as claimed in claim 1, wherein the heat-sensitive color forming layer has a thickness of from 5 to 10 μm.
Claim 8
Dependent Claim
26 words
A heat-sensitive recording sheet as claimed in any of claims 1 or 2, wherein the base paper has an optical contact ratio of at least 20%.
Claim 9
Dependent Claim
22 words
A heat-sensitive recording sheet as claimed in claim 7, wherein the optical contact ratio of the base paper is at least 25%.
References Cited (Backward Citations)
US4032690A
Cited
US4098114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |