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:
Jul. 10, 1979
Filed:
Apr. 19, 1978
Mark M Locey, Rochester, NY (US);
William F Gottermeier, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Biaxially-oriented, heatset polyester film is heat relaxed at a uniform temperature and supported buy impingement with gas such as air, while subjecting the film to low tension in its longitudinal dimension. Undesirable draw lines, as defined herein, are avoided by maintaining the longitudinal dimension of the film in an arcuate configuration composed of a single curve or serpentine succession of curves free of straight segments. Each such curve is characterized as having a radius of curvature in the range from about 1 inch to about 8 inches, subtending an arc of no less than 40.degree.. A serpentine configuration is preferred in which case the gas impinges upon alternate sides of the web. Temperatures of heat relaxation preferably are within the range from 30 to 100 centrigrade degrees higher than the polyester glass transition temperature.