The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 1977
Filed:
Jan. 27, 1975
Applicant:
Inventors:
John V Bailey, New Martinsville, WV (US);
Thomas H Cleveland, New Martinsville, WV (US);
Emanuel W Wirfel, Coraopolis, PA (US);
Assignee:
Mobay Chemical Corporation, Pittsburgh, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C08G / ;
U.S. Cl.
CPC ...
260 / ; 260463 ;
Abstract
This invention relates to polycarbonates and more particularly to recovering unreacted bisphenol-A from the alkaline phase generated in the production of polycarbonates, comprising reacting the alkaline phase with phosgene to convert the unreacted bisphenol-A to a low molecular weight polymer and returning a solvent solution of the low molecular weight polymer to the main reaction stream.
Bailey, John. (1977). Utilization of bisphenol-a from the alkaline phase generated in the (U.S. Patent No. 4025489). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4025489
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile