US3916070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-sensitive copying paper containing lactone compound of pyridine carboxylic acid
Assignee: Hodogaya Chemical Co Ltd
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Filing: 1974-03-15
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Granted: 1975-10-28
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Expires: 1994-03-15
Abstract
Abstract A pressure-sensitive copying paper comprising an adsorbent solid acid and a microencapsulated color former capable of forming a destinct color when reacted with the adsorbent acid coated on the same or a different surface of a support or supports, the microencapsulated color former being at least one lactone compound derived from a pyridine-carboxylic acid represented by the formula; or a mixture thereof, wherein A, A'' and Y are as defined hereinafter, is disclosed.
Inventors
- 👤 Minoru Ozutsumi
- 👤 Yoshihide Miyazawa
- 👤 Katsuichi Motohashi
- 👤 Taiji Watanabe
- 👤 Sadao Ishige
- 👤 Keiso Saeki
- 👤 Akio Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:53
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/04; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; Y; Y10; Y10T; Y10T428/00; Y10T428/25
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
45 words
A PRESSURE-SENSITIVE COPYING PAPER COMPRISING ON A SUPPORT A LAYER OF AN ENCAPSULATED COLOR FORMER AND ON THE SAME OR DIFFERENT SUPPOR A LAYER O AN ELECTRON ACCEPTING SOLID, SAID COLOR FORMER BEING A LACTONE COMPOUND DERIVED FROM A PYRIDINE-CARBOXYLIC ACID, REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
45 words
A PRESSURE-SENSITIVE COPYING PAPER COMPRISING ON A SUPPORT A LAYER OF AN ENCAPSULATED COLOR FORMER AND ON THE SAME OR DIFFERENT SUPPOR A LAYER O AN ELECTRON ACCEPTING SOLID, SAID COLOR FORMER BEING A LACTONE COMPOUND DERIVED FROM A PYRIDINE-CARBOXYLIC ACID, REPRESENTED BY THE FORMULA
Claim 3
Dependent Claim
246 words
The pressure-sensitive copying paper according to claim 1, wherein said color-former is a compound selected from the group consisting of: 2-( Alpha -(9''-ethylcarbazol-(3'')-yl)- Alpha -(1'', 2''dimethylindol (3'')-yl -methyl-pyridine-carboxylic acid-(3) lactone, 3-( Alpha -(9''-ethylcarbazol-(3'')-yl)- Alpha -(1'',2''-dimethylindol-(3'')-yl)- Alpha -oxy)-methyl-pyridine-carboxylic acid-(2) lactone, an isomer mixture comprising 2-( Alpha -(9''-ethylcarbazol-(3'')-yl)- Alpha -(1'',2''-dimethylindol-(3'')-yl)- Alpha -oxy)-methyl-pyridine-carboxylic acid-(3) lactone and 3-( Alpha -(9''-ethylcarbazol-(3'')-yl)- Alpha -(1'',2''-dimethylindol-(3'')-yl)-Alpha -oxy)-methyl-pyridine-carboxylic acid-(2) lactone, an isomer mixture comprising 2-( Alpha (9''-ethylcarbazol-(3'')-yl)- Alpha -(1'',2''-dimethyl-5''-methoxyindol-(3'')-yl)- Alpha -oxy)-methyl-pyridine-carboxylic acid-(3) lactone and 3(- Alpha -(9''-ethylcarbazol-(3'')-yl)- Alpha -(1'',2''-dimethyl-5''-methoxyindol-(3'')-yl)- Alpha -oxy)-methyl-pyridine-carboxylic acid-(2) lactone, an isomer mixture comprising 2-( Alpha , Alpha -di-(9''-ethylcarbazol- (3'')-yl)- Alpha -oxy)-methyl-pyridine-carboxylic acid-(3) lactone and 3-( Alpha , Alpha -di-(9''-ethylcarbazol-(3'')-yl)- Alpha -oxy)-methyl-pyridine-carboxylic acid-(2) lactone, an isomer mixture comprising 2-( Alpha -(1''-methylpyrrol-(2'')-yl)- Alpha -(9''-ethylcarbazol-(3'')-yl )- Alpha -oxy)-methyl-pyridine-carboxylic acid-(3) lactone and 3-( Alpha -(1''-methylpyrrol-(2'')-yl)- Alpha -(9''-ethylcarbazol-(3'')-yl)- Alpha -oxy )-methyl-pyridine-carboxylic acid-(2) lactone, an isomer mixture comprising 2-( Alpha -(acridin-(2'') -yl)-Alpha -(thianaphthen-(2'')-yl)- Alpha -oxy)-methyl-pyridine-carboxylic acid-(3) lactone and 3-( Alpha -(acridin-(2'')-yl)-Alpha -(thianaphthen-(2'')-yl) Alpha -oxy)-methyl-pyridine-carboxylic acid-(2) lactone, an isomer mixture comprising 2-( Alpha -(10''-methylphenothiazin-(3'')-yl)- Alpha -(1'',2''-dimethylindol-(3'')-yl)- Alpha -oxy)-methyl-pyridine-carboxylic acid-(3) lactone and 3-( Alpha -(10''-methylphenothiazin-(3'')-yl)- Alpha -(1'',2''-dimethylindol-(3'')-yl)- Alpha -oxy)-methyl-pyridine-carboxylic acid-(2) lactone, an isomer mixture comprising 2-( Alpha -(thiophen-(2'')-yl) Alpha -(1,'',2''-dimethylindol-(3'')-yl)- Alpha -oxy)-methyl-pYridine-carboxylic acid-(3) lactone and 3-( Alpha -(thiophen-(2'')-yl)-Alpha -(1'',2''-dimethyl-indol-(3'')-yl)- Alpha -oxy)-methyl-pyridine-carboxylic acid-(2) lactone, an isomer mixture comprising 2-( Alpha -(thianaphthen-(2'')-yl)-Alpha -(1'',2''-dimethylindol-(3'')-yl)- Alpha -oxy)-methyl-pyridine-carboxylic acid-(3) lactone and 3-( Alpha -(thianaphthen-(2'')-yl)- Alpha -(1'',2''-dimethylindol-(3'')-yl)-Alpha -oxy)-methyl-pyridine-carboxylic acid-(2) lactone, and an isomer -mixture comprising 2-( Alpha -(1'',2''-dimethylindol-(3'')-yl)- Alpha -(thiophen-(2'')-yl)- Alpha -oxy)-methyl-4-chloro-pyridine-carboxylic acid-(3) lactone and 3-( Alpha -(1'', 2''-dimethylindol-(3'')-yl)- Alpha -(thiophen-(2'')-yl)- Alpha -oxy)-methyl-4-chloro-pyridine-carboxylic acid-(2) lactone.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |