US3804855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Naphthalide compounds
Assignee: WTA Inc
•
Filing: 1972-03-22
•
Granted: 1974-04-16
•
Expires: 1992-03-22
Abstract
Abstract COLORLESS, BUT COLORABLE NAPHTHALIDE COMPOUNDS ARE DISCLOSED, WHICH ARE REPRESENTED BY THE FORMULA: 3-(4-((R1-)2-N-)PHENYL),3-X-1H,3H-NAPHTHO(1,8-CD)PYRAN- 1-ONE WHEREIN X IS 1-R-PYRROL-2-YL OR 1,2-DI(R-)INDOL-3-YL EACH R IS HYDROGEN, AN ALKYL RADICAL HAVING 1 TO 5 CARBON ATOMS, PHENYL OR BENZYL AND EACH R'' IS HYDROGEN OR AN ALKYL RADICAL HAVING 1 TO 5 CARBON ATOMS. THESE COMPOUNDS ARE USED IN PRESSURE-SENSITIVE RECORD MATERIAL AND IN MARK-FORMING MANIFOLD SYSTEMS.
Inventors
- 👤 S Farber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:16
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/323; B41M5/327; C; C07; C07D; C07D405/00; C07D405/02; C07D405/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |