Patent US4076887A successfully refreshed from Google Patents.
US4076887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording sheets
Assignee: Fujifilm Holdings Corp
•
Filing: 1976-10-28
•
Granted: 1978-02-28
•
Expires: 1996-10-28
Abstract
Abstract A recording sheet comprising a support and a developer layer, which develops color images on reacting with a color former, on the support containing a dimer of the compound represented by the formula: ##STR1## wherein R 1 , R 2 and R 3 each represents a hydrogen atom, an alkyl group, an aryl group, or an aralkyl group, and n is 1 to 4.
Inventors
- 👤 Nobuo Tsuji
- 👤 Sadao Ishige
- 👤 Akio Miyamoto
- 👤 Hajime Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:32
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A pressure-sensitive recording sheet comprising a support having a developer layer on the support, said developer layer being capable of developing color images on reacting with a color former, wherein the developer layer contains as a developer a dimer of the compound represented by the formula: ##STR5## wherein R 1 , R 2 , and R 3 each represents a hydrogen atom, an alkyl group, an aryl group, or an aralkyl group, and n is 1 to 4.
Claim 2
Dependent Claim
78 words
A pressure-sensitive recording sheet comprising a support having a developer layer on the support, said developer layer being capable of developing color images on reacting with a color former, wherein the developer layer contains as a developer a dimer of the compound represented by the formula: ##STR5## wherein R 1 , R 2 , and R 3 each represents a hydrogen atom, an alkyl group, an aryl group, or an aralkyl group, and n is 1 to 4.
Claim 3
Dependent Claim
17 words
The recording sheet according to claim 1, wherein the alkyl group contains 1 to 30 carbon atoms.
Claim 4
Dependent Claim
21 words
The recording sheet according to claim 1, wherein the aralkyl group contains an alkyl moiety containing 1 to 30 carbon atoms.
Claim 5
Dependent Claim
22 words
The recording sheet according to claim 1, wherein the OH group is present at the meta-or para-position relative to the ##STR6## moiety.
Claim 6
Dependent Claim
14 words
The recording sheet according to claim 1, wherein R 1 is a hydrogen atom.
Claim 7
Dependent Claim
14 words
The recording sheet according to claim 1, wherein R 2 is an alkyl group.
Claim 8
Dependent Claim
20 words
The recording sheet according to claim 1, wherein said dimer is a dimer of the compound having the formula ##STR7##
Claim 9
Dependent Claim
14 words
The recording sheet according to claim 1, wherein R 3 is a hydrogen atom.
Claim 10
Dependent Claim
20 words
The recording sheet according to claim 1, wherein said dimer is a dimer of the compound having the formula ##STR8##
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |