Polyester film
Patent 4908277 Issued on March 13, 1990. Estimated Expiration Date: 
March 16, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 16, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3018189 3136655 3186883 3364056 Treating polymeric surfaces Coated polyester films Copolyester primed polyester film Magnetic recording medium Graphic film having a copolyester primed polyester film as its substrate Magnetic recording medium Patent #: 4748084 InventorsAssigneeApplicationNo. 168944 filed on 03/16/1988US Classes:428/480, Of polyester (e.g., alkyd, etc.)428/483, Next to addition polymer from unsaturated monomers428/516Monoolefin polymerExaminersPrimary: Herbert, Thomas J. Jr.Attorney, Agent or FirmInternational ClassesB32B 027/08B32B 027/36 Foreign Application Priority Data1987-03-16 JPAbstractThe present invention is directed to a polyester film comprising at least at its surface portion oriented sulfonic acid groups and/or salts thereof with an orientation degree of 5-100, which has an excellent adhesiveness, especially excellent anti-alkaline adhesiveness. The present invention also makes it possible to provide a polyester film having, in addition to the excellent adhesiveness, an excellent transparency, antistatic property and waterproof property.Other References
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