US3920510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-and-heat-sensitive copying paper
Assignee: Yamamoto Chemicals Inc
•
Filing: 1973-07-31
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Granted: 1975-11-18
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Expires: 1993-07-31
Abstract
Abstract A heat or pressure sensitive copying paper is provided containing a fluoran compound as a color former, said color being developed in said heat or pressure sensitive copying paper through the application of heat or pressure, said fluoran compound being of the formula WHEREIN R1 is halogen; R2 is hydrogen or methyl; R3 is hydrogen, methyl or ethyl; each of R4 is independently halogen or methyl; R5 is methyl or ethyl; and n is 0 or an integer from 1 to 4.
Inventors
- 👤 Yoshihiro Hatano
- 👤 Kenji Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:41
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; B41M5/1455; B41M5/26; B41M5/30; B41M5/323; B41M5/327; B41M5/3275; C; C07; C07D; C07D493/00; C07D493/02; C07D493/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
41 words
A HEAT OR PRESSURE SENSITIVE COPYING PAPER CONTAINING A FLUORAN COMPOUND AS A COLOR FORMER, SAID COLOR BEING DEVELOPED IN SAID HEAT OR PRESSURE SENSITIVE COPYING PAPER THROUGH THE APPLICATION OF HEAT OR PRESSURE, SAID FLUORAN COMPOUND BEING OF THE FORMULA
Claim 2
Dependent Claim
41 words
A HEAT OR PRESSURE SENSITIVE COPYING PAPER CONTAINING A FLUORAN COMPOUND AS A COLOR FORMER, SAID COLOR BEING DEVELOPED IN SAID HEAT OR PRESSURE SENSITIVE COPYING PAPER THROUGH THE APPLICATION OF HEAT OR PRESSURE, SAID FLUORAN COMPOUND BEING OF THE FORMULA
Claim 3
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-p-chloroanilino-6-diethylaminofluoran.
Claim 4
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-m-chloroanilino-6-diethylaminofluoran.
Claim 5
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-o-chloroanilino-6-diethylaminofluoran.
Claim 6
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-(3'',5''-dichloroanilino)-6-diethylaminofluoran.
Claim 7
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-(3'',4''-dichloroanilino)-6-diethylaminofluoran.
Claim 8
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-p-chloroanilino-3-methyl-6-diethylaminofluoran.
Claim 9
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-m-chloroanilino-3-methyl-6-diethylaminofluoran.
Claim 10
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-o-chloroanilino-3-methyl-6-diethylaminofluoran.
Claim 11
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-p-bromoanilino-3-methyl-6-diethylaminofluoran.
Claim 12
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-(4''-chloro-3''-methylanilino)-3-methyl-6-diethylaminofluoran.
Claim 13
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-(3'',5''-dichloroanilino)-3-methyl-6-diethylaminofluoran.
Claim 14
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-(3'',4''-dichloroanilino)-3-methyl-6-diethylaminofluoran.
Claim 15
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-(2'',5''-dichloroanilino)-6-diethylaminofluoran.
Claim 16
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-(4''-chloro-N-methylanilino)-6-diethylaminofluoran.
Claim 17
Dependent Claim
15 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-(4''-chloro-N-ethylanilino)-6-diethylaminofluoran.
Claim 18
Dependent Claim
16 words
A heat or pressure sensitive copying paper of claim 1 wherein said fluoran is 2-(4''-chloro-3-'' -methylanilino)-3-methyl-6-dimethylaminofluoran.
Claim 19
Dependent Claim
8 words
A heat sensitive copying paper of claim 1.
Claim 20
Dependent Claim
8 words
A pressure sensitive copying paper of claim 1.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |