US Patent No: 5,141,973

Number of patents in Portfolio can not be more than 2000

Method of preparing polyvinyl alcohol gel

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Abstract

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A method of preparing a polyvinyl alcohol hydrogel contains the steps of charging an aqueous solution of a polyvinyl alcohol having a degree of hydrolysis of not less than 95 mol % and an average polymerization degree of not less than 500 into a container, the aqueous solution containing the polyvinyl alcohol in a concentration of not less than 5 wt. %, cooling the aqueous solution of the polyvinyl alcohol at a temperature of from -(minus) 9.degree. C. to - (minus) 3.degree. C., subjecting the aqueous solution of the polyvinyl alcohol to physical stimulation, and then maintaining the aqueous solution of the polyvinyl alcohol at a temperature of from - (minus) 5.degree. C. to + (plus) 5.degree. C. The polyvinyl alcohol hydrogel may be contained in a plastic container. An MRI phanton is composed of the plastic container containing such polyvinyl alcohol hydrogel.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
NIPPON MITSUBISHI OIL CORPORATIONTOKYO339

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kobayashi, Tomokazu Suwa, JP 19 38
Morihiro, Toshio Yokohama, JP 1 16

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Nippon Oil Co., Ltd. (3)
4,472,542 Freeze-dried polyvinyl alcohol gel 52 1983
4,734,097 Medical material of polyvinyl alcohol and process of making 75 1985
4,916,170 Process for making skin marker 32 1988
 
Cities Service Oil and Gas Corporation (1)
4,939,203 Gel for retarding water flow 5 1988
 
KABUSHIKI KAISHA TOSHIBA (1)
4,774,957 Material for diagnosis by nuclear magnetic resonance imaging 35 1987
 
OFPG (1)
4,772,641 Aqueous sulfomethylated melamine gel-forming compositions 4 1985
 
Rhone-Poulenc Chimie (1)
4,737,533 Dry material which can be hydrated into an aqueous gel, containing dispersed polymer particles, process for the preparation thereof and use thereof in biological applications 15 1987
 
SHIN-ETSU CHEMICAL CO., LTD. (1)
4,788,242 Polyvinyl alcohol-based reversibly hydrated gel, highly water-absorptive resin and method for the preparation thereof 5 1987

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
GEORGIA TECH RESEARCH CORPORATION (6)
8,002,830 Surface directed cellular attachment 4 2005
7,910,124 Load bearing biocompatible device 4 2005
8,142,808 Method of treating joints with hydrogel implants 2 2008
7,682,540 Method of making hydrogel implants 19 2008
8,318,192 Method of making load bearing hydrogel implants 1 2008
8,486,436 Articular joint implant 0 2012
 
COOPERSURGICAL, INC. (3)
6,117,072 Plastic stay assembly for use with MRI and X-ray imaging systems 8 1998
5,964,698 Sliding hook assembly for use with a surgical retractor stay apparatus and methods for use 21 1999
6,190,312 Variable geometry retractor and disposable retractor stay clips and method of use 17 1999
 
ALZA CORPORATION (2)
6,246,904 Electrotransport drug delivery reservoirs containing inert fillers 11 1997
6,039,977 Pharmaceutical hydrogel formulations, and associated drug delivery devices and methods 18 1997
 
CARTICEPT MEDICAL, INC. (1)
8,038,920 Methods of producing PVA hydrogel implants and related devices 0 2007
 
MIMEDX GROUP, INC. (1)
8,603,171 Spinal disc implants with flexible keels and methods of fabricating implants 0 2007
 
STICHTING VOOR DE TECHNISCHE WETENSCHAPPEN (1)
6,224,969 Optical phantom suitable for stimulating the optical properties of biological material and a method of producing said phantom 21 1998
 
TAKEDA CHEMICAL INDUSTRIES, LTD. (1)
5,346,935 Hydrogel 21 1993
 
Other [Check patent profile for assignment information] (1)
6,650,934 Polymeric foam reservoirs for an electrotransport delivery device 3 1997