Patents by Inventor Tiang-Shing Chang
Tiang-Shing Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 5753723Abstract: An improved denture fixative composition comprising an adhesion promoter and a highly cross-linked copolymer of a lower alkyl vinyl ether and maleic anhydride or acid is disclosed wherein at least 65.0% of the total number of initial carboxyl groups in the copolymer are reacted. The cross-linking agent employed in this invention is calcium cation and optionally up to about 30.0% of the calcium function can be replaced with other inorganic cross-linking agents or polyhydroxy compounds either singly or in combination. The adhesion promoters are chelating agents such as polycarboxylic acids, hydroxycarboxylic acids, aminocarboxylic acids, polyphosphoric acids and their alkali salts.Type: GrantFiled: July 25, 1997Date of Patent: May 19, 1998Inventors: Tiang Shing Chang, Donna Diferdinando
-
Patent number: 5750591Abstract: A denture adhesive with significantly improved hold performance is comprised of the mixed partial salts of polymethyl vinyl ether maleic acid. At least one of said salts comprises zirconium while a second salt is selected from the group consisting of calcium, zinc, magnesium, iron, strontium and mixtures thereof. Optionally, a tripartite salt formulation may be prepared utilizing sodium, lithium or potassium. The adhesives are formulated in a standard pharmaceutically acceptable vehicle comprised of waxes, oils, colorants, viscosity modifiers and the like as is known in the art. The denture adhesive may be formulated as a paste, powder or liquid which has rapid absorption characteristics for faster swelling softening and superior coalescence.Type: GrantFiled: March 3, 1997Date of Patent: May 12, 1998Assignee: The Block Drug CompanyInventors: Hal C. Clarke, Hyung-Kook Ahn, Eddie Wong, Robert C. Gasman, Alfred J. Smetana, Joseph Synodis, Tiang Shing Chang
-
Patent number: 5696181Abstract: An improved denture adhesive composition is comprised of a highly cross-linked lower alkyl ether/maleic acid or maleic anhydride copolymer in which up to about 85% of the initial free carboxyl groups are reacted with one or more cross-linking agents. The cross-linking agents are mixtures of inorganic divalent cations such as calcium, magnesium and zinc together with organic bifunctional compounds comprised of polyhydroxyl compounds such as propylene glycol, glycerin and the like. The copolymer has a specific viscosity of no less than 1.5. A hydrophilic polymer such as sodium alginate or carboxymethyl cellulose may also be added to the lower alkyl vinyl ether/maleic acid or maleic anhydride copolymer which is then formulated with other excipients in a paste, powder, liquid, gel or cream composition.Type: GrantFiled: September 22, 1995Date of Patent: December 9, 1997Assignee: The Block Drug Company, Inc.Inventors: Tiang-Shing Chang, Donna DiFerdinando
-
Patent number: 5188755Abstract: A surface erodible controlled releasing, free standing cleaning block for domestic water closets comprises controlled releasing agent, erosion rate modifier, processing aid, acidic chelating agent, color indicator, density modifier and internal lubricant.Type: GrantFiled: October 10, 1991Date of Patent: February 23, 1993Assignee: Block Drug CompanyInventor: Tiang-Shing Chang
-
Patent number: 5120528Abstract: This invention relates to a mild oral hygiene composition such as a toothpaste, dental gel, mouthrinse or tooth powder containing a mild surfactant, protein fatty acid condensate or acid hydrolyzed, hydrolyzed animal protein or the mixtures thereof, and in combination therewith, mild high foaming surfactant, e.g., disodium cocoamido MIPA sulfosuccinate or disodium oleamido PEG-2 sulfosuccinate or disodium lauryl sulfosuccinate or the mixtures thereof; or a natural emulsifier, e.g., lecithin, or both a mild surfactant and a nautral emulsifier.Type: GrantFiled: June 12, 1991Date of Patent: June 9, 1992Assignee: Block Drug Company, Inc.Inventors: Tiang-shing Chang, Joseph Kanapka, Michael C. Alfano
-
Patent number: 4986754Abstract: A nonshrinkable, thermoplastic and injectable endodontic filling composition. The composition is a mixture of transpolyisoprene, either naturally produced as balata or gutta percha, or synthesized from isoprene, and a liquid castor ester platicizer. Alternatively, the mixture comprises transpolyisoprene, a liquid castor ester plasticizer and a liquid castor oil or dimethyl silcon fluid lubricant. The mixture is preferably a combination of the transpolyisoprene, the liquid castor ester plasticizer and the liquid castor oil or liquid dimethyl silicon fluid lubricant or both. The composition is compounded to form a highly thermoplastic material which is injectable at a clinically acceptable temperature with a manually operated injection system without shrinkage of the composition after placement in a dental root canal.Type: GrantFiled: July 2, 1990Date of Patent: January 22, 1991Assignee: Block Drug Co., Inc.Inventors: Tiang-shing Chang, Lisa N. W. Marchese
-
Patent number: 4950697Abstract: A nonshrinkable, thermoplastic and injectable endodontic filling composition. The composition is a mixture of transpolyisoprene, either naturally produced as balata or gutta percha, or synthesized from isoprene, and a liquid castor ester platicizer. Alternatively, the mixture comprises transpolyisoprene, a liquid castor ester platicizer and castor oil or dimethyl silicon fluid lubricant. The mixture is preferably a combination of the transpolyisoprene, the liquid castor ester plasticizer and the liquid castor oil or dimethyl silicon fluid lubricant or both. The composition is compounded to form a highly thermoplastic material which is injectable at a clinically acceptable temperature with a manually operated injection system without shrinkage of the composition after placement in a dental root canal.Type: GrantFiled: September 15, 1988Date of Patent: August 21, 1990Assignee: Block Drug Co., Inc.Inventors: Tiang-shing Chang, Lisa N. Weddle Marchese
-
Patent number: 4544356Abstract: A dental prophylactic device has a handle section containing a drive member and a driven section at a substantial angle to the handle section containing a driven member also at an angle to the driving member. The handle section includes a longitudinally oscillatable cam follower supported parallel to the handle axis. When the cam follower is translated around the axis by the rotation of the drive shaft, it is caused to oscillate by one end contacting the stationary cam follower track. The other end engages a slot parallel to the axis of a cam at an angle to the cam follower thereby causing the cam to oscillate back and forth over an arc of at least 50.degree. to approximately 150.degree., maintaining the connection between the cam follower and the cam by the use of the slot which permits the cam follower, in effect, to move up and down with respect to the cam as it oscillates.Type: GrantFiled: November 15, 1984Date of Patent: October 1, 1985Assignee: Block Drug Company Inc.Inventors: John M. Gardella, Casimir Ciepierski, Michael Alfano, Tiang-Shing Chang
-
Patent number: 4542168Abstract: A denture fixative composition contains as the active fixative a partially neutralized and crosslinked polyacrylic acid or a precursor combination of the polyacrylic acid, neutralizing agent(s) and crosslinking agent(s) which is adapted to form the active fixative, and at least one hydrophilic polymer, preferably, sodium carboxymethyl cellulose, hydroxypropyl guar or sodium alginate.Type: GrantFiled: February 6, 1984Date of Patent: September 17, 1985Assignee: Block Drug Co., Inc.Inventors: Tiang-Shing Chang, Lucy J. Zientek, Arthur Viningauz
-
Patent number: 4521551Abstract: Denture fixative compositions contain denture fixative excipients and as the denture fixative, a water soluble partially neutralized alkyl vinyl ether-maleic acid or anhydride copolymer, optionally partly crosslinked, and at least one hydrophilic polymer, preferably sodium carboxymethylcellulose, polyethylene oxide or hydroxypropyl guar.Type: GrantFiled: December 2, 1983Date of Patent: June 4, 1985Assignee: Block Drug Company, Inc.Inventors: Tiang-Shing Chang, Lucy J. Zientek
-
Patent number: 4470814Abstract: A method for adhering dentures to oral mucosa with a denture fixative composition containing as the active fixative a partially neutralized and crosslinked polyacrylic acid or a precursor combination of the polyacrylic acid, neutralizing agent(s) and crosslinking agent(s) which is adapted to form the active fixative, and at least one hydrophilic polymer, preferably, sodium carboxymethyl cellulose, hydroxypropyl guar or sodium alginate.Type: GrantFiled: September 2, 1983Date of Patent: September 11, 1984Assignee: Block Drug Company, Inc.Inventors: Tiang-Shing Chang, Lucy J. Zientek, Arthur Viningauz
-
Patent number: 4373036Abstract: A denture fixative composition contains a dentally acceptable excipient and an effective fixative amount of a fixative mixture comprising hydroxypropyl cellulose and at least one partially neutralized alkyl vinyl ether-maleic acid or anhydride copolymer, optionally partly crosslinked, or a partially neutralized, optionally partly crosslinked polyacrylic acid or a precursor combination of the copolymer or polyacrylic acid, neutralizing agents, and optionally crosslinking agents, which is adapted to form the fixative in situ, or polyethylene oxide.Type: GrantFiled: December 21, 1981Date of Patent: February 8, 1983Assignee: Block Drug Company, Inc.Inventors: Tiang-Shing Chang, Lucy J. Zientek, Arthur Viningauz, Marcy L. Scheps
-
Patent number: 4310516Abstract: An anhydrous pseudoplastic and thixotropic oleaginous vehicle is prepared by mixing at least one solid emulsifying agent having an HLB number of 12 or less with an oleaginous material and then cooling the mixture over a temperature range of at least about 15.degree. C., said range encompassing the pour point of said agent.Type: GrantFiled: February 1, 1980Date of Patent: January 12, 1982Assignee: Block Drug Company Inc.Inventors: Tiang-Shing Chang, Lucy J. Zientek