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. 16, 2001
Filed:
Aug. 29, 1997
Janet L. Gordon, Clifton Park, NY (US);
Kevin R. Stewart, Schenectady, NY (US);
Molecular OptoElectronics Corporation, Watervliet, NY (US);
Abstract
Linear polycarbonate polymers are disclosed which contain spirobiindanol derivatives regularly alternating in the polymeric chain with derivatives of dihydroxyaromatic compounds, such as biphenols and bisphenols. These clear spirobiindane-dihydroxyaromatic polycarbonates exhibit high glass transition temperatures and exhibit good mechanical and optical properties. In addition, the alternating polycarbonates are thermally stable and remain ductile even at temperatures greater than 150° C. The polycarbonates are therefore useful in high temperature processing and optical applications. The disclosed polycarbonates exhibit indices of refraction that differ sufficiently from those of randomly distributed SBI/BPA polycarbonates to make them useful in the manufacture of optical waveguides.