US3567707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disazo coupling procedure
Assignee: HD ACQUISITION CORP A CORP OF DE
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Filing: 1968-04-04
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Granted: 1971-03-02
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Expires: 1988-04-04
Abstract
Abstract THE PROCESS OF COUPLING TETRAZOTIZED 3,3''-DICHLOROBENZIDINE WITH 3-METHYL-1-P-TOLYL-2-PYRAZOLIN-5-ONE OR 3METHYL-1-PHENYL-2-PYRAZOLIN-5-ONE AT A PH OF 0.5 TO 1.0 RESULTS IN THE FORMATION OF KNOWN PIGMENTS HAVING IMPROVED DRY CLEANING FASTNESS AND LIGHTFASTNESS.
Inventors
- 👤 Arthur S Neave Jr
- 👤 Arthur J Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:04
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/08; C09B35/10; C09B35/18
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |