US3746563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive record sheet employing alkyl or halo substituted tetrahalofluorans
Assignee: Appvion LLC
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Filing: 1971-10-01
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Granted: 1973-07-17
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Expires: 1991-10-01
Abstract
Abstract A CHROMOGENIC MATERIAL OF NORMALLY COLORLESS FORM IS DISCLOSED HAVING THE STRUCTURAL FORMULA: 3-(O=),4,5,6,7-TETRA(CL-),6''-((C2H5)2-N-),1''-R1,2''-R2, 3''-R3,4''-R4-SPIRO(PHTHALAN-1,9''-XANTHENE) WHEREIN EACH R1, R2, R3 OR R4 IS HYDROGEN, AN ALKYL RADICAL HAVING 1 TO 4 CARBON ATOMS OR CHLORINE AND AT LEAST ONE OF SAID R GROUPS IS AN ALKYL RADICAL OR CHLORINE.
Inventors
- 👤 S Farber
- 👤 A Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:00
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; B41M5/1455
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |