US3619239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive copying paper
Assignee: Fujifilm Holdings Corp
•
Filing: 1969-12-10
•
Granted: 1971-11-09
•
Expires: 1989-12-10
Abstract
Abstract WHEREIN N IS AN INTEGER OF 1 TO 4; R1 and R2 represent an alkyl group having 1 to 4 carbon atoms or a phenyl group; R3 represents a hydrogen atom, an alkoxyl group wherein the alkyl group is an alkyl group having 1 to 4 carbon atoms, an alkoxycarbonyl group wherein the alkyl group is an alkyl group having 1 to 4 carbon atoms or a halogen atom. A novel color forming material used in a pressure sensitive copying paper comprises
Inventors
- 👤 Chiaki Osada
- 👤 Hisatake Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:20
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/15; B01; B01J; B01J13/00; B01J13/02; B01J13/025; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31844; Y10T428/31848
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
The pressure sensitive copying paper as claimed in claim 1 wherein said compound is from the group consisting of 1- Beta -carboxythyl-3,3-dimethyl-spiro(indoline-2,2''-2''H- Beta -naphthopyrane), 1- Beta -carboxyethyl3,3,5-trimethylspiro(indoline-2,2''-2''H- Beta -naphthopyrane) or 1- Beta -carboxyethyl-3,3-dimethyl-5-chlorospiro(indoline-2,2''-2''H- Beta -naphthopyrane). 3. The pressure sensitive copying paper as claimed in claim 1 wherein said electron acceptive material is from the group consisting of acid clay, active clay, attapulgite, zeolite, Roline, bentonite, silica gel, aluminum sulfate, feldspar, pyrophyllite, halloysite, magnesium trisilicate, zinc sulfate, zinc sulfide, calcium fluoride, calcium citrate, tannic acid or benzoic acid.
Claim 2
Dependent Claim
7 words
A coloring-forming compound represented by the formula:
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |