US4283458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive recording paper containing a novel electron accepting compound
Assignee: Fujifilm Holdings Corp
•
Filing: 1979-07-17
•
Granted: 1981-08-11
•
Expires: 1999-07-17
Abstract
Abstract A heat-sensitive recording sheet comprising a support and a recording layer containing an electron donating colorless dye and a compound represented by the following formula: ##STR1## wherein R represents an alkyl group containing 2 to 12 carbon atoms.
Inventors
- 👤 Akira Igarashi
- 👤 Kozo Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:14
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/333; B41M5/3333; B41M5/3335; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
40 words
A heat-sensitive recording sheet consisting essentially of a support and a recording layer containing an electron donating colorless dye and a compound represented by the following formula: ##STR3## wherein R represents an alkyl group containing 5 to 8 carbon atoms.
Claim 2
Dependent Claim
40 words
A heat-sensitive recording sheet consisting essentially of a support and a recording layer containing an electron donating colorless dye and a compound represented by the following formula: ##STR3## wherein R represents an alkyl group containing 5 to 8 carbon atoms.
Claim 3
Dependent Claim
24 words
The heat-sensitive recording sheet of claim 1, wherein said compound is selected from the group consisting of 1,1-bis(4-hydroxyphenyl)hexane, 1,1-bis(4-hydroxyphenyl)heptane, 1,1-bis(4-hydroxyphenyl)octane, 1,1-bis(4-hydroxyphenyl)-2-methyl-pentane, 1,1-bis(4-hydroxyphenyl)-2-ethyl-hexane, and 1,1-bis(4-hydroxyphenyl)dodecane.
Claim 4
Dependent Claim
23 words
The heat-sensitive recording sheet of claim 1, wherein said compound has a melting point in the range of about 60° to 130° C.
Claim 5
Dependent Claim
30 words
The heat-sensitive recording sheet of claim 1, wherein said electron donating colorless dye is a triarylmethane compound, a diphenylmethane compound, a xanthene compound, a thiazine compound or a spiropyran compound.
Claim 6
Dependent Claim
27 words
The heat-sensitive recording sheet of claim 1, wherein the compound of the formula is present in a coating amount of about 0.8 to 5.0 g/m 2 .
Claim 7
Dependent Claim
26 words
The heat-sensitive recording sheet of claim 1, wherein said electron donating colorless dye is present in a coating amount of 0.1 to 2.0 g/m 2 .
Claim 8
Dependent Claim
22 words
The heat-sensitive recording sheet of claim 1, wherein said colorless dye is selected from the group consisting of 3-diethylamino-7-(o-chloroanilino)fluoran, 3-(N-methyl-N-tolylamino)-6-methyl-7-anilinofluoran, and 3-(N-ethyl-N-tolylamino)-6-methyl-7-anilinofluoran.
Claim 9
Dependent Claim
17 words
The heat-sensitive recording sheet of claim 1, wherein said alkyl group is a branched chain alkyl group.
References Cited (Backward Citations)
US3445261A
Cited
US3539375A
Cited
US3674535A
Cited
US3792481A
Cited
US3816122A
Cited
US3895173A
Cited
US3937864A
Cited
US4012554A
Cited
US3959571A
Cited
US3950600A
Cited
US4144072A
Cited
US4151748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |