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. 17, 1979
Filed:
Oct. 14, 1977
Henry M Schleinitz, Kennett Square, PA (US);
Paul G Stephan, Landenberg, PA (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
Low attenuation, all-plastic optical fiber is made by using starting materials which are rigorously purified to remove light-absorbing impurities and solid particles of dirt, polymerizing the core monomer under pressure with a heating schedule which leads to at least 98% conversion to polymer as a cylindrical preform, and ram extruding the core of the optical fiber while melting only the forward end of the preform of core polymer so as to preclude contamination of the core by dirt or formation of bubbles by polymer degradation. Optical fibers so made exhibit light attenuations as low as 300 dB/km or lower.