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Class Information
Number: 528/308.3
Name: Synthetic resins or natural rubbers -- part of the class 520 series > Synthetic resins (class 520, subclass 1) > From carboxylic acid or derivative thereof > From di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereof > Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acid > Polyethylene terephthalate per se > Processes of preparing
Description: Subject matter wherein the process of polymerization involving the stated reactants is claimed.

Sub-classes under this class:

Class Number Class Name Patents
528/308.5 At least two claimed distinct temperature or pressure gradients 63
528/308.4 In presence of hydrocarbon, steam or water 22

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
5344912 Elevated temperature dimensionally stable polyester with low gas permeability Sep. 6, 1994
5322921 Polyester yarn Jun. 21, 1994
5278281 Polyesters showing a high crystallization rate and procedure for their preparation Jan. 11, 1994
5235027 Modified copolyethylene terephthalate Aug. 10, 1993
5134221 Adhesive compositions Jul. 28, 1992
5041525 Process for manufacture of shaped polyethylene terephthalate structures in the presence of molecular sieve catalyst Aug. 20, 1991
4973655 Continuous production of linear thermoplastic polyesters Nov. 27, 1990
4933429 Method for preparing polyester-polyepoxide compositions of high melt viscosity Jun. 12, 1990
4931538 Copolyester and polyester resin composition comprising said copolyester Jun. 5, 1990
4861860 Process for producing polyester Aug. 29, 1989
4820795 Polyester vessel and package Apr. 11, 1989
4758650 Process and apparatus for producing high molecular weight polyesters Jul. 19, 1988
4705844 Rapidly crystallizing polyester materials and a process for their preparation Nov. 10, 1987
4675378 Process control system Jun. 23, 1987
4647650 Process for the production of polyester Mar. 3, 1987
4612363 Process for the production of polyester Sep. 16, 1986
4609721 Process for making molding grade polyethylene terephthalate Sep. 2, 1986
4595715 Oriented polyester film containing calcium carbonate and kaolinite Jun. 17, 1986
4594406 Polyesters and their manufacture from acids and glycol carbonates Jun. 10, 1986
4578502 Polyethylene terephthalate saponification process Mar. 25, 1986
4521585 Polyesters and their manufacture from acids and glycol carbonates Jun. 4, 1985
4435562 Process for the production of polyester copolymers Mar. 6, 1984
4382139 Process and apparatus for continuous production of polyesters May. 3, 1983
4359557 Process for producing low pilling textile fiber and product of the process Nov. 16, 1982
4348314 Production of thermally stabilized polyester with alkylene carbonates and sodium or potassium thiocyanate Sep. 7, 1982
4313870 Process for producing polycondensates Feb. 2, 1982
4289871 Method to increase reactor capacity for polycondensation of polyesters Sep. 15, 1981
4254253 Preparation of high molecular weight polyester Mar. 3, 1981
4248996 Preparation of linear high molecular weight saturated polyesters Feb. 3, 1981
4238593 Method for production of a high molecular weight polyester prepared from a prepolymer polyester having an optimal carboxyl content Dec. 9, 1980
4237261 Process for continuously producing polyester and spun fiber Dec. 2, 1980
4230818 Reduction of glycol ethers in polyesters Oct. 28, 1980
4205157 Method for production of high molecular weight polyester with low catalyst level and low carboxyl content May. 27, 1980
4161578 Process for solid phase polymerization of polyester Jul. 17, 1979
4101523 Polyester films Jul. 18, 1978
4077945 Process for making linear polyesters from ethylene glycol and terephthalic acid Mar. 7, 1978
4064112 Process for the continuous production of high molecular weight polyethylene terephthalate Dec. 20, 1977
4010145 Process and catalyst inhibitor systems for preparing synthetic linear polyesters Mar. 1, 1977

1 2 3

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