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Class Information
Number: 521/131
Name: Synthetic resins or natural rubbers -- part of the class 520 series > Synthetic resins (class 520, subclass 1) > Cellular products or processes of preparing a cellular product, e.g., foams, pores, channels, etc. > Cellular product formation prior to or during solid polymer formation in the presence of a stated ingredient other than water > Ingredient contains only carbon and hydrogen atoms, only c and halogen atoms, or only c, h, and halogen atoms
Description: Subject matter wherein the stated ingredient contains (1) only carbon and hydrogen atoms, or (2) only carbon, hydrogen, and halogen atoms, or (3) only carbon and halogen atoms.










Sub-classes under this class:

Class Number Class Name Patents
521/132 Said ingredient is substantially nonvolatile material, e.g., hydrocarbon waxes, greases, etc. 110


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Patent Number Title Of Patent Date Issued
5733472 Compositions which include 1,1,2,2-tetrafluoroethane and fluoropropane Mar. 31, 1998
5730894 1,1,2,2,3,3,4,4-octafluorobutane azeotropic (like) compositions Mar. 24, 1998
5730896 Polymeric foams Mar. 24, 1998
5728315 Azeotrope-like compositions of trifluoromethane, carbon dioxide, ethane and hexafluoroethane Mar. 17, 1998
5723508 Method of fabricating emulsion freeze-dried scaffold bodies and resulting products Mar. 3, 1998
5723509 Azeotrope-like compositions of dimethoxymethane, cyclopentane and 2-methyl pentane and the use thereof in the production of foams Mar. 3, 1998
5721285 Thermal insulating foamed material and method of manufacturing the same Feb. 24, 1998
5716541 Azeotrope-like compositions of 1,1,1,3,3 pentafluoropropane and tetramethylsilane Feb. 10, 1998
5703136 Polymeric foams Dec. 30, 1997
5700843 1,1,1,2-tetrafluoroethane as a blowing agent in integral skin polyurethane shoe soles Dec. 23, 1997
5700845 Carbon black containing EPDM compositions and process for producing same Dec. 23, 1997
5698606 Process for rigid polyurethane foams Dec. 16, 1997
5693686 Foam-forming mixtures with decreased decomposition of hydrohalocarbon blowing agents Dec. 2, 1997
5693684 Sprayable, foam-forming, phenolic resin compostion, method of spraying a foam-forming, phenolic resin composition, and a sprayed foam Dec. 2, 1997
5693685 Thermal insulator and method for producing the same Dec. 2, 1997
5688834 Catalysts which stabilize hydrohalocarbon blowing agent in polyurethane foam formulations Nov. 18, 1997
5688835 Preparation of polyurethane rigid foams Nov. 18, 1997
5688833 Azeotrope-like compositions of 1 1 1 3 3-pentafluoropropane and 1 1-dichloro-1-fluoroethane Nov. 18, 1997
5686499 Polyurethane foams containing high levels of silicone-containing surfactant polymer to improve flame retardance and aged K-factors Nov. 11, 1997
5684057 Three component polyol blend for use in insulating rigid polyurethane foams Nov. 4, 1997
5684056 Polyisocyanate-based foam and blowing agent therefor Nov. 4, 1997
5681501 Compositions including a hydrofluoropropane Oct. 28, 1997
5677358 Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and hydrocarbons Oct. 14, 1997
5677359 Three component polyol blend for use in insulating rigid polyurethane foams Oct. 14, 1997
5672294 Azeotrope-like compositions of 1,1,1,3,3-pentaflurorpropane and hydrocarbons Sep. 30, 1997
5670554 Production of CFC-free polyurethane rigid foams having a reduced thermal conductivity and their use Sep. 23, 1997
5665788 Azeotropic compositions of dimethoxymethane and cyclopentane and the use thereof in the production of foams Sep. 9, 1997
5661190 1,1,1,2-tetrafluoroethane as a blowing agent in integral skin polyurethane shoe soles Aug. 26, 1997
5652278 Microvoid polyurethane materials Jul. 29, 1997
5649430 Insulating foam of low thermal conductivity and method of preparation Jul. 22, 1997
5648019 Three component polyol blend for use in insulating rigid polyurethane foams Jul. 15, 1997
5646196 C.sub.3 to C.sub.5 polyfluorcalkanes propellants Jul. 8, 1997
5631306 Foamable composition containing unsaturated perfluorochemical blowing agent May. 20, 1997
5631305 Azeotropic compositions of dimethoxymethane and cyclopentane and the use thereof in the production of foams May. 20, 1997
5624969 Production of rigid foams based on isocyanate Apr. 29, 1997
5624968 Flexible water-blown polyurethane foams Apr. 29, 1997
5624970 C.sub.3 to C.sub.5 polyfluorcalkanes propellants Apr. 29, 1997
5614565 Azeotropic compositions of perfluorohexane and hydrocarbons having 6 carbon atoms and the use thereof in the production of foams Mar. 25, 1997
5604265 Process for rigid polyurethane foams Feb. 18, 1997
5602190 Process for the production of hard polyurethane foams Feb. 11, 1997
5601753 Blowing composition, method for producing foam using the composition and foam Feb. 11, 1997
5602189 Process for forming polyisocyantate-based foam and product formed thereby Feb. 11, 1997
5599851 Superfine microelemental biochemical mixture and foamed plastic products thereof Feb. 4, 1997
5596022 Blowing agents for phenolic resins Jan. 21, 1997
5596021 Crosslinkable polyester/isocyanate compositions suitable for preparing composite manufactured articles, in particular by means of injection processes, process for preparing them and their use Jan. 21, 1997
5580906 Ternary azeotropic compositions Dec. 3, 1996
5580649 Expandable styrene type resin particles and foamed articles from said particles Dec. 3, 1996
5578653 Preparation of cellular polyurethanes Nov. 26, 1996
5578656 Methods of preparing polymeric foams using cyclic urea blowing promoters Nov. 26, 1996
5578651 Process for producing rigid polyurethane foams Nov. 26, 1996

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