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:
Mar. 22, 1977
Filed:
Jul. 22, 1975
Applicant:
Inventor:
Richard C Weil, Monroeville, PA (US);
Assignee:
United States Steel Corporation, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B03B / ;
U.S. Cl.
CPC ...
209-9 ; 209237 ;
Abstract
In the manufacture of thermoplastic resin particles by polymerization, size classification by screening of polymerized particles at rates from 27 to 69-lbs/hr-ft.sup.2 is improved by the use of solid finely divided phosphates and carbonates in amounts of from 500 to 3000 ppm of such salts provided that this amount is above the breakdown point in classification of the particles for such rates of screening.