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:
Jan. 06, 1981
Filed:
Mar. 12, 1979
Applicant:
Inventor:
John J Mulcahy, Beverly, MA (US);
Assignee:
Gloucester Engineering Co., Inc., Gloucester, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
425140 ; 264 402 ; 425 / ; 425172 ; 4253261 ;
Abstract
A blown-film system, for producing plastic tubing, in which the rate of flow of air, into or out of the tube, is made directly dependent upon the deviation in position of the tube wall and in which stability in tube size is achieved by providing a control system that feeds back both tube circumference and air valve position to drive a valve motor.