Patent BE510307A successfully refreshed from Google Patents.
Patent US2816900A successfully refreshed from Google Patents.
US2816900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of methyl violet
Assignee: Wyeth Holdings LLC
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Filing: 1954-10-14
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Granted: 1957-12-17
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Expires: 1974-10-14
Abstract
No abstract record available.
Inventors
- 👤 Guy S Herrick
- 👤 Joseph C Conger
- 👤 Mario W Savio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:11
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN THE PROCESS OF PRODUCING METHYL VIOLET BY THE OXIDATION OF DIMETHYLANILINE IN THE PRESENCE OF A COPPER SALTS, THE IMPROVEMENT WHICH COMPRISES, IN A PHENOLICBODY-FREE SYSTEM EMULSIFYING THE DIMETHYLANILINE IN A SOLUTION OF THE COPPER SALT WITH AN EMULSIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKYLOL-SUBSTITUTED ALIPHATIC GUANIDINIUM N-ALKYLOL-SUBSTITUTED ALIPHATIC CARBAMATES, ALKYL AMINOALKYL IMIDAZOLINES, POLYAMINO ESTERS, LONG CHAIN QUATERNARY AMMONIUM COMPOUNDS, SOIDIUM ALKYL NAPHTHALENE SULFONATES, OIL-SOLUBLE PETROLEUM SULFONATES, OCTYL ALCOHOL AND DIBUTYL PHTHALATE, AND OXIDIZING THE EMULSIFIED DIMETHYLANILINE WHEREBY METHYL VIOLET FREE FROM OBJECTIONABLE ODORS IS PRODUCED.
Claim 2
Dependent Claim
89 words
IN THE PROCESS OF PRODUCING METHYL VIOLET BY THE OXIDATION OF DIMETHYLANILINE IN THE PRESENCE OF A COPPER SALTS, THE IMPROVEMENT WHICH COMPRISES, IN A PHENOLICBODY-FREE SYSTEM EMULSIFYING THE DIMETHYLANILINE IN A SOLUTION OF THE COPPER SALT WITH AN EMULSIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKYLOL-SUBSTITUTED ALIPHATIC GUANIDINIUM N-ALKYLOL-SUBSTITUTED ALIPHATIC CARBAMATES, ALKYL AMINOALKYL IMIDAZOLINES, POLYAMINO ESTERS, LONG CHAIN QUATERNARY AMMONIUM COMPOUNDS, SOIDIUM ALKYL NAPHTHALENE SULFONATES, OIL-SOLUBLE PETROLEUM SULFONATES, OCTYL ALCOHOL AND DIBUTYL PHTHALATE, AND OXIDIZING THE EMULSIFIED DIMETHYLANILINE WHEREBY METHYL VIOLET FREE FROM OBJECTIONABLE ODORS IS PRODUCED.
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) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |