Patent US3070418A successfully refreshed from Google Patents.
US3070418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-crystallizing methyl violet paste
Assignee: Wyeth Holdings LLC
•
Filing: 1960-02-05
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Granted: 1962-12-25
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Expires: 1980-02-05
Abstract
No abstract record available.
Inventors
- 👤 Robert F Bann
- 👤 Norman W Fiess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:38
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A STABLE NON-SEPARATING, NON-CRYSTALLIZING, DLUID, AQUEOUS DYESTUFF PASTE COMPRISING MRTHYL VIOLET, A WATERMISCIBLE ORGANIC SOLVENT AND META-DIHYDROXY BENZENE,SAID PASTE HAVING A PH OF 2.5 TO 4.5.
Claim 2
Dependent Claim
26 words
A STABLE NON-SEPARATING, NON-CRYSTALLIZING, DLUID, AQUEOUS DYESTUFF PASTE COMPRISING MRTHYL VIOLET, A WATERMISCIBLE ORGANIC SOLVENT AND META-DIHYDROXY BENZENE,SAID PASTE HAVING A PH OF 2.5 TO 4.5.
References Cited (Backward Citations)
US1016295A
Cited
US1157705A
Cited
US1834314A
Cited
US2118432A
Cited
US2489537A
Cited
US2901311A
Cited
US2852331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |