US3864145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive copying paper
Assignee: Yamamoto Chemicals Inc
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Filing: 1972-11-29
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Granted: 1975-02-04
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Expires: 1992-11-29
Abstract
Abstract An excellent pressure sensitive copying paper is provided by applying a color former certain encapsuled 6-di lower alkyl amino-naphthalfluoran compounds to either a single sheet or to the upper leaf of a pressure sensitive paper. The color former is soluble in aromatic solvents and also has excellent light fastness.
Inventors
- 👤 Hiromitsu Seki
- 👤 Kenji Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:14
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/24; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; B41M5/1455
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
46 words
Pressure sensitive copying paper according to claim 1 comprising an upper leaf having said fluoran compound applied thereto, said compound being dissolved in a solvent of low volatility and the resulting solution being packed in minute capsules, and lower leaf having applied thereto a solid acid.
Claim 2
Dependent Claim
44 words
Pressure sensitive copying paper according to claim 1 in which a single sheet of paper has applied thereto sAid fluoran compound, said compound being dissolved in a solvent of low volatility and the resulting solution being packed in minute capsules, and a solid acid.
Claim 3
Dependent Claim
14 words
Pressure sensitive copying paper according to claim 1 wherein the fluoran compound is 3-methyl-6-ethylamino-7-methylnaphthalfluoran.
Claim 4
Dependent Claim
14 words
Pressure sensitive copying paper according to claim 1 wherein the fluoran compound is 2-methyl-6-ethylamino-7-methylnaphthalfluoran.
Claim 5
Dependent Claim
14 words
Pressure sensitive copying paper according to claim 1 wherein the fluoran compound is 2-chloro-3-methyl-6-ethylamino-7-methylnaphthalfluoran.
Claim 6
Dependent Claim
14 words
Pressure sensitive copying paper according to claim 1 wherein the fluoran compound is 3-chloro-6-ethylamino-7-methylnaphthalfluoran.
Claim 7
Dependent Claim
14 words
Pressure sensitive copying paper according to claim 1 wherein the fluoran compound is 1,2-benzo-6-ethylamino-7-methylnaphthalfluoran.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |