Patent US3903173A successfully refreshed from Google Patents.
US3903173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lower alkylthiomethylene containing phenols
Assignee: Novartis AG
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Filing: 1970-04-21
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Granted: 1975-09-02
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Expires: 1990-04-21
Abstract
Abstract Mono and dimethylene thioethers of dialkyl phenols are prepared by reacting dialkyl phenols at elevated temperatures with formaldehyde and the respective mercapto compound in an inert solvent in the presence of an alkaline compound.
Inventors
- 👤 Heinz Eggensperger
- 👤 Volker Franzen
- 👤 Gerd Huhner
- 👤 Dieter Woltjes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:37
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/04; C09K15/12; C09K15/14; C07; C07C; C07C323/00; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/375
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
AS NEW COMPOSITION OF MATTER, COMPOUNDS OF THE FORMULA
Claim 2
Dependent Claim
9 words
AS NEW COMPOSITION OF MATTER, COMPOUNDS 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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |