Patent US1872973A successfully refreshed from Google Patents.
Patent US3812192A successfully refreshed from Google Patents.
US3812192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of polythiobisphenols
Assignee: Inventa AG fuer Forschung und Patentverwertung
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Filing: 1972-05-15
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Granted: 1974-05-21
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Expires: 1992-05-15
Abstract
Abstract A PHENOL WHICH IS UNSUBSTITUTED AT THE POSITION PARA TO THE HYDROXY GROUP OR UNSUBSTITUTED AT AT LEAST ONE OF THE POSITIONS ORTHO TO THE HYDROXY GROUP IS DISSOLVED IN A SOLVENT, IN THE ABSENCE OF HYDROGEN SULFIDE AND CATALYSTS, AND WHILE COOLING TO A TEMPERATURE BELOW 30* C. IS REACTED WITH DISULFUR DICHLORIDE. THE SOLVENT IS AN ACID AMIDE WHOSE NITROGEN ATOMS ARE COMPLETELY ALKYLATED. POLYTHIOBISPHENOLS ARE OBTAINED IN HIGH YIELD.
Inventors
- 👤 R Gabler
- 👤 J Studinka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:49
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/375; C07; C07C; C07C323/00
Claims Analysis
Total Claims: 0
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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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |