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:
Apr. 07, 1987
Filed:
Mar. 27, 1986
Phillip A Waitkus, Sheboygan, WI (US);
Bohumir Lepeska, Sheboygan, WI (US);
Plastics Engineering Company, Sheboygan, WI (US);
Abstract
The process described herein involves the gradual addition of aqueous formaldehyde, containing 35-60 percent by weight of formaldehyde, to a phenol maintained at a temperature of 60.degree.-100.degree. C., preferably 70.degree.-90.degree. C., and at a reduced pressure of 11-26 inches of mercury in the presence of an alkaline catalyst. The rate of formaldehyde addition is such that the exothermic reaction aids in maintaining the stated temperature range and thereby simultaneously distills approximately all the water added with the formaldehyde and that formed by the condensation so that the volume of the reaction mass is maintained approximately constant. This constant volume allows efficient use of the equipment.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile