Patent US3687929A successfully refreshed from Google Patents.
US3687929A
Expired / Lapsed
US
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Basic dyestuffs containing a quaternized pyridine or quinoline radical
Assignee: Individual
•
Filing: 1969-05-26
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Granted: 1972-08-29
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Expires: 1989-05-26
Abstract
Abstract Basic azo-dyestuffs containing a quaternized pyridine- or quinoline carbonyloxy- or carbonylimino-radical bound to an aromatic nucleus directly or via an alkylene-, alkylene- oxy- or alkyleneimino bridge.
Inventors
- 👤 Visvanathan Ramanathan
- 👤 Hans Wilhelm Liechti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:35
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/50; C09B23/00; C09B23/14; C09B23/143; C09B25/00; C09B47/00; C09B47/04; C09B47/32; C09B5/00; C09B5/02; C09B5/10; C09B51/00; C09B69/00; C09B69/001
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
7 words
A basic azo dyestuff of the formula
Claim 2
Dependent Claim
5 words
The dyestuff of the formula
Claim 3
Dependent Claim
5 words
The dyestuff of the formula
Claim 4
Dependent Claim
5 words
The dyestuff of 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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |