Patents by Inventor Yunchang Zhang

Yunchang Zhang 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: 5882545
    Abstract: The oxygen generation composition utilizes magnesium oxide to modify and smooth the oxygen generation rate, suppress chlorine formation, improve the rheology and uniformity of performance of an operating chemical oxygen candle, and to facilitate the mixing of the candle ingredients. The oxygen generation composition typically comprises a metal powder as a fuel; magnesium oxide; and an oxygen source selected from the group consisting of alkali metal chlorates, alkali metal perchlorates, and mixtures thereof. The composition can also include a transition metal oxide catalyst, and can include a binder.
    Type: Grant
    Filed: May 15, 1996
    Date of Patent: March 16, 1999
    Assignee: Nellcor Puritan Bennett Incorporated
    Inventors: Yunchang Zhang, James C. Cannon
  • Patent number: 5783105
    Abstract: The oxygen generation compositions are tin fueled to produce a significantly lower carbon monoxide contamination of the breathable oxygen generated. The oxygen generating compositions comprise about 0.5-15% by weight of tin powder as a fuel and rheology modifier; from zero to about 15% by weight of a transition metal oxide catalyst; about 0.1-5% by weight of an alkaline compound as a chlorine remover and reaction rate modifier; and the remainder of an oxygen source selected from the group consisting of alkali metal chlorates, alkali metal perchlorates, and mixtures thereof. The oxygen generating composition can optionally further include up to about 5% of a binder. The oxygen generating compositions have a smoother, more uniform rate of oxygen generation, lower temperature sensitivity, and a lower operating temperature than comparable chlorate/perchlorate oxygen generation compositions utilizing iron powder as a fuel.
    Type: Grant
    Filed: November 9, 1995
    Date of Patent: July 21, 1998
    Assignee: Nellcor Puritan Bennett
    Inventors: Yunchang Zhang, James C. Cannon
  • Patent number: 5338516
    Abstract: An improved chemical oxygen generator (10) includes an oxygen generating candle (12) having an oxygen source, which upon decomposition will yield oxygen, and a nontoxic additive to smooth decomposition and suppress formation of toxic free chlorine gas. The nontoxic additive may be taken from the group consisting of: (1) the oxides, hydroxides and carbonates of calcium and the rare earth elements; (2) the hydroxides and carbonates of magnesium; and (3) mixtures of the foregoing. A complete chemical oxygen generator utilizes the candle (12) of the invention. The oxygen generator preferably includes a canister (14), oxygen-generating candle (12), and an ignition device (16). Triggering of the ignition device ignites an ignition pellet (52) which initiates decomposition of the candle body (50). Once initiated, the candle will sustain decomposition to release breathable oxygen until the candle is completely reacted.
    Type: Grant
    Filed: December 10, 1992
    Date of Patent: August 16, 1994
    Assignee: Puritan-Bennett Corporation
    Inventors: Yunchang Zhang, James C. Cannon
  • Patent number: 5298187
    Abstract: An oxygen-generating candle composition is disclosed of the type that includes an amount of an alkali metal chlorate or perchlorate oxygen source and which upon initiation and decomposition yields oxygen and residual chlorine, wherein the improvement comprises a non-toxic additive in the candle composition for suppression of the residual chlorine and to enhance uniform oxygen generation and evolution. The additive is selected from the group consisting of from about 0.05% to about 10% by weight of lithium aluminate, metaborate, tetraborate, phosphate or pyrophosphate, metasilicate or orthsilicate, or carbonate, calcium phosphate or pyrophosphate, strontium carbonate or phosphate, or sodium metasilicate or orthosilicate. A metal oxide catalyst, a metal powder fuel, and a binder or filler are also included in the composition.
    Type: Grant
    Filed: March 13, 1992
    Date of Patent: March 29, 1994
    Assignee: Puritan-Bennett Corporation
    Inventors: Yunchang Zhang, James C. Cannon
  • Patent number: 5279761
    Abstract: An oxygen-generating candle composition is disclosed of the type that includes an amount of an alkali metal chlorate or perchlorate oxygen source and which upon initiation and decomposition yields oxygen and residual chlorine, wherein the improvement comprises a non-toxic additive in the candle composition for suppression of the residual chlorine and to enhance uniform oxygen generation and evolution. The additive comprises from about 0.1% to about 1.0% by weight of lithium peroxide. The composition also includes a cobalt oxide catalyst, an iron powder fuel and a binder or filler.
    Type: Grant
    Filed: March 13, 1992
    Date of Patent: January 18, 1994
    Assignee: Puritan-Bennett Corporation
    Inventors: Yunchang Zhang, James C. Cannon
  • Patent number: 5198147
    Abstract: An improved chemical oxygen generator (10) includes an oxygen generating candle (12) having an oxygen source, which upon decomposition will yield oxygen, and a nontoxic additive to smooth decomposition and suppress formation of toxic free chlorine gas. The nontoxic additive may be taken from the group consisting of: (1) the oxides, hydroxides and carbonates of calcium and the rare earth elements; (2) the hydroxides and carbonates of magnesium; and (3) mixtures of the foregoing. A complete chemical oxygen generator utilizes the candle (12) of the invention. The oxygen generator preferably includes a canister (14), oxygen-generating candle (12), and an ignition device (16). Triggering of the ignition device ignites an ignition pellet (52) which initiates decomposition of the candle body (50). Once initiated, the candle will sustain decomposition to release breathable oxygen until the candle is completely reacted.
    Type: Grant
    Filed: April 10, 1991
    Date of Patent: March 30, 1993
    Assignee: Puritan-Bennett Corporation
    Inventors: Yunchang Zhang, James C. Cannon
  • Patent number: 5040552
    Abstract: An iron carbide heat source, particularly useful in smoking articles, is provided. The iron carbide particles making up the heat source have ignition temperatures that are substantially lower than conventional carbon particles normally used in carbonaceous heat sources, while at the same time provide sufficient heat to release a flavored aerosol from a flavor bed for inhalation by the smoker. In a preferred embodiment, the iron carbide heat source of this invention is substantially cylindrical in shape and has one or more fluid passages therethrough. Upon combustion, the heat source produces substantially no carbon monoxide.
    Type: Grant
    Filed: December 8, 1988
    Date of Patent: August 20, 1991
    Assignee: Philip Morris Incorporated
    Inventors: Donald M. Schleich, Yunchang Zhang
  • Patent number: RE36199
    Abstract: An improved chemical oxygen generator (10) includes an oxygen generating candle (12) having an oxygen source, which upon decomposition will yield oxygen, and a nontoxic additive to smooth decomposition and suppress formation of toxic free chlorine gas. The nontoxic additive may be taken from the group consisting of: (1) the oxides, hydroxides .?.and carbonates.!. of calcium and the rare earth elements; (2) the hydroxides .?.and carbonates.!. of magnesium; and (3) mixtures of the foregoing. A complete chemical oxygen generator utilizes the candle (12) of the invention. The oxygen generator preferably includes a canister (14), oxygen-generating candle (12), and an ignition device (16). Triggering of the ignition device ignites an ignition pellet (52) which initiates decomposition of the candle body (50). Once initiated, the candle will sustain decomposition to release breathable oxygen until the candle is completely reacted.
    Type: Grant
    Filed: February 7, 1997
    Date of Patent: April 27, 1999
    Assignee: BE Intellectual Property, Inc.
    Inventors: Yunchang Zhang, James C. Cannon