Patent US2838474A successfully refreshed from Google Patents.
US2838474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation products of bisphenols with aromatic vinyl compounds
Assignee: Rain Carbon Germany GmbH
•
Filing: 1954-01-28
•
Granted: 1958-06-10
•
Expires: 1974-01-28
Abstract
No abstract record available.
Inventors
- 👤 Meis Helmut
- 👤 Sauer Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:22
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28; C08G8/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS FOR PREPARING A CONDENSATION PRODUCT COMPRISING HEATING ONE MOL OF A BISPHENOL FORMED BY THE CONDENSATION OF A KETONE WITH A PHENOL SELECTED FROM THE GROUP CONSISTING OF PHENOL, CRESOLS AND DIMETHYL PHENOLS, WITH 2-10 MOLS OF AN AROMATIC VINYL COMPOUND SELECTED FROM THE GROUP CONSISTING OF STYRENE AND LOWER ALKYL-SUBSTITUTED STYRENES, IN THE PRESENCE OF AN ORGANIC LIQUID WHICH IS INERT TO THE BISPHENOL AND TO THE VINYL COMPOUND, AND IN THE PRESENCE OF A SURFACE ACTIVE BLEACHING EARTH.
Claim 2
Dependent Claim
82 words
A PROCESS FOR PREPARING A CONDENSATION PRODUCT COMPRISING HEATING ONE MOL OF A BISPHENOL FORMED BY THE CONDENSATION OF A KETONE WITH A PHENOL SELECTED FROM THE GROUP CONSISTING OF PHENOL, CRESOLS AND DIMETHYL PHENOLS, WITH 2-10 MOLS OF AN AROMATIC VINYL COMPOUND SELECTED FROM THE GROUP CONSISTING OF STYRENE AND LOWER ALKYL-SUBSTITUTED STYRENES, IN THE PRESENCE OF AN ORGANIC LIQUID WHICH IS INERT TO THE BISPHENOL AND TO THE VINYL COMPOUND, AND IN THE PRESENCE OF A SURFACE ACTIVE BLEACHING EARTH.
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) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |