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:
Nov. 06, 1979
Filed:
Oct. 03, 1977
Frank M Stieger, Newton Highlands, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
In a method for manufacturing photographic film processing rollers useful in processing self-processable type film units, an adhesive priming composition is first applied to the surface of a cylindrical metal rod of given length. The rod is then pushed through a cross-head extrusion die to deposit a melted polymer comprising an elastomeric urethane resin on its surface to provide the rod's surface with a thin coating whose coefficient of friction is greater than that of the metal. The extruded coating is then hardened, and then the rod is cut into roller segments each having a predetermined length. Afterwards, each roller segment is centerless ground to provide it with journals at its opposite ends and to reduce the thickness of the polymeric coating intermediate the journals to provide a film-contacting traction coating of predetermined thickness and smoothness.