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CHANG SING HSIUNG

Overview
  • Total Patents
    14
About

CHANG SING HSIUNG has a total of 14 patent applications. Its first patent ever was published in 1976. It filed its patents most often in Canada, United States and WIPO (World Intellectual Property Organization). Its main competitors in its focus markets optics, macromolecular chemistry and polymers and medical technology are CONTACT LENS MFG LTD, PARAGON OPTICAL INC and BENZ RES & DEV.

Patent filings per year

Chart showing CHANG SING HSIUNGs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Chang Sing-Hsiung 13
#2 Chang Mei Zyh 4
#3 Sing-Hsiung Chang 1
#4 Chang Mei-Zyh 1
#5 Mei-Zyh Chang 1

Latest patents

Publication Filing date Title
US5258490A Non-irritating soft gas permeable contact lens and process for producing same
NZ237120A Soft, hydrophilic gas permeable contact lens comprising a polymer of a vinyl siloxane monomer and a hydrophilic monomer having a higher proportion of hydroxy acylic monomer units to silicone units in the surface as compared with the lens body
CA2040419A1 Soft gas permeable contact lens having improved clinical performance
WO9104283A1 Soft gas permeable contact lens having improved clinical performance
EP0441916A1 Method for making soft contact lenses
CA2040415A1 Non-irritating soft gas permeable contact lens and process for producing same
CN1031237A The multipolymer of tool wettability, wetting ability, flexibility and oxygen penetrance
WO8805060A1 Wettable, hydrophilic, soft and oxygen permeable copolymer compositions
US4343927A Hydrophilic, soft and oxygen permeable copolymer compositions
US4182822A Hydrophilic, soft and oxygen permeable copolymer composition