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Class Information
Number: 521/58
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. > Particle which is expandible, process of preparing an expandible particle, or process of expanding a particle to form a cellular product > Expanding utilizing plural expansion steps
Description: Subject matter wherein the expansion steps occur in a plurality of stages.










Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8282851 Anisotropic cellular elastomers Oct. 9, 2012
8268901 Coated particulate expandable polylactic acid Sep. 18, 2012
8153700 Roofing system and method Apr. 10, 2012
8129438 Method for producing foamed polyolefin resin beads Mar. 6, 2012
8067476 Foamed thermoplastic polyurethanes Nov. 29, 2011
8063177 Pre-expanded polypropylene resin particle, and method for production thereof Nov. 22, 2011
8058320 Thermally foamable microsphere, production method thereof, use thereof, composition containing the same, and article Nov. 15, 2011
7863342 Fire resistant materials Jan. 4, 2011
7772294 Fire resistant materials Aug. 10, 2010
7456227 Polymer particles and related articles Nov. 25, 2008
7456228 Durable foam of olefin polymers, methods of making foam and articles prepared from same Nov. 25, 2008
7358280 Process for processing expandable polymer particles and foam article thereof Apr. 15, 2008
7202284 Foamed thermoplastic polyurethanes Apr. 10, 2007
7175728 Heat-peelable adhesive sheet Feb. 13, 2007
7067030 Heat-peelable adhesive sheet Jun. 27, 2006
6797734 Polypropylene resin pre-expanded particle and in-mold expanded article thereof Sep. 28, 2004
6723760 Method for producing expanded or expandable polyolefin particles Apr. 20, 2004
6627668 Process for preparing polyolefin pre-expanded particles Sep. 30, 2003
6596782 Hydrous polyolefin resin composition, preexpanded particles produced therefrom, process for producing the same, and expanded molding Jul. 22, 2003
6593382 Polyolefin resin pre-expanded particles and process for preparing the same Jul. 15, 2003
6593383 Process for preparing polyolefin pre-expanded particles Jul. 15, 2003
6573306 Process for the preparation of expandable polyvinylarene particles Jun. 3, 2003
6538042 Porous polymer particles Mar. 25, 2003
6506807 Process for preparing pre-expanded particles of thermoplastic resin Jan. 14, 2003
6476089 Expandable olefin bead polymers Nov. 5, 2002
6455599 Process for the preparation of expanded polyvinylarene particles Sep. 24, 2002
6399665 Dry expansion of expandable polymer beads Jun. 4, 2002
6348511 Method and device for multifoaming of expandable plastics Feb. 19, 2002
6326409 In-mold foaming article of polypropylene resin composition Dec. 4, 2001
6297292 Water expanded polystyrene particles Oct. 2, 2001
6271272 Expandable polystyrene composition, expanded beads and moulded parts Aug. 7, 2001
6265463 Degradation of expandable polymer bead products Jul. 24, 2001
6239185 Method for producing expanded polyolefin particles May. 29, 2001
6214896 Water-containing polypropylene resin composition and pre-expanded particles made thereof Apr. 10, 2001
6167892 Method for washing prefoamed particles Jan. 2, 2001
6166096 Pre-expanded particles of polypropylene resin, process for producing the same and process for producing in-mold foamed articles therefrom Dec. 26, 2000
6130266 Pre-expanded particles of propylene resin, process for preparing the same and flow-restricting device Oct. 10, 2000
6034144 Molded article of foamed and expanded beads of propylene resin Mar. 7, 2000
6013687 Pre-expanded polyolefin foam beads Jan. 11, 2000
5942551 Non-crosslinked linear low density polyethylene preexpanded particles and manufacturing method therefor Aug. 24, 1999
5917011 Short-cycle removal of impurities from polymers Jun. 29, 1999
5905096 Continuous production process of expandable styrene polymer beads May. 18, 1999
5886061 Polymers capable of reversibly complexing acid gases and foamed polymers produced therefrom Mar. 23, 1999
5883141 Process for preparing polyolefin resin pre-expanded particles Mar. 16, 1999
5866641 Process for the production of lightweight cellular composites of wood waste and thermoplastic polymers Feb. 2, 1999
5830922 Process for post-expansion of pre-expanded polyolefins beads Nov. 3, 1998
5821272 Method for post-treatment of polyolefin resin pre-expanded particles Oct. 13, 1998
5798437 Thermoplastic block copolymers Aug. 25, 1998
5773481 Polyolefin particle foam Jun. 30, 1998
5763498 Moldable thermoplastic polymer foam beads Jun. 9, 1998

1 2 3 4










 
 
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