US3418322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quinacridone dyestuffs
Assignee: 3M Co
•
Filing: 1964-05-07
•
Granted: 1968-12-24
•
Expires: 1984-05-07
Abstract
No abstract record available.
Inventors
- 👤 Tulagin Vsevolod
- 👤 Robert F Coles
- 👤 Richard A Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:35
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/42; C09B11/00; C09B11/04; C09B29/00; C09B29/0003; C09B29/34; C09B29/36; C09B29/3604; C09B29/3647; C09B29/3652; C09B29/366; C09B43/00; C09B47/00; C09B47/04; C09B47/08; C09B47/12; C09B47/16; C09B47/24; C09B47/26; C09B48/00; C09B5/00; C09B5/02; C09B5/14; C09B5/24; C09B5/32; C09B69/00; C09B7/00; C09B7/10; G; G03; G03G; G03G13/00; G03G13/01; G03G17/00; G03G17/02; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/087; G03G5/09; G03G5/12; Y; Y10; Y10S; Y10S534/00; Y10S534/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A DYESTUFF INSOLUBLE IN WATER AT A PH ABOVE 7 AND SOLUBLE IN WATER AT A PH BELOW 7 OF THE GENERAL STRUCTURAL FORMULA
Claim 2
Dependent Claim
24 words
A DYESTUFF INSOLUBLE IN WATER AT A PH ABOVE 7 AND SOLUBLE IN WATER AT A PH BELOW 7 OF THE GENERAL STRUCTURAL FORMULA
References Cited (Backward Citations)
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Cited
US2756234A
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US2151518A
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US2238485A
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US2972508A
Cited
US2945849A
Cited
US3139421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |