Patents by Inventor Richard G. Copperthwaite

Richard G. Copperthwaite 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).

  • Process for the production of methyl amines
    Patent number: 5488165
    Abstract: A modified natural clinoptilolite, produced by treating a natural clinoptilolite with a suitable mineral acid or with a suitable alkali and then with a suitable mineral acid, is used as a catalyst in a process for the conversion of methanol and ammonia to give a product containing at least 50% by weight of monomethylamine.
    Type: Grant
    Filed: December 30, 1991
    Date of Patent: January 30, 1996
    Assignee: Zeofuels Research (Proprietary) Limited
    Inventors: Graham J. Hutchin, Themistoclis Themistocleous, Richard G. Copperthwaite
  • Modified clinoptilolite as an ion exchange material
    Patent number: 5268107
    Abstract: An ion exchange material for the removal of radioisotope cations such as the cations of caesium and strontium from an aqueous environment containing the radioisotope cation comprises a modified clinoptilolite produced by treating a natural clinoptilolite with sodium hydroxide at a concentration of approximately 2M or with hydrochloric acid at a concentration of from 0.1 to 5M for a suitable treatment time and at a suitable treatment temperature. The modified clinoptilolite is especially effective in the removal of radioisotope cations from an aqueous environment.
    Type: Grant
    Filed: December 30, 1991
    Date of Patent: December 7, 1993
    Assignee: Zeofuels Research (Proprietary) Limited
    Inventors: Graham J. Hutchings, Themistoclis Themistocleous, Richard G. Copperthwaite
  • Conversion of propane and butane
    Patent number: 5162598
    Abstract: A modified natural clinoptilolite, produced by treating a natural clinoptilolite with a suitable mineral acid or with a suitable alkali and then with a suitable mineral acid, is used as a catalyst in a process for the conversion of propane or butane to give a product containing at least 40% of ethene, propene or C.sub.4 hydrocarbons or a mixture thereof.
    Type: Grant
    Filed: December 30, 1991
    Date of Patent: November 10, 1992
    Assignee: Zeofuels Research (Proprietary) Limited
    Inventors: Graham J. Hutchings, Themistoclis Themistocleous, Richard G. Copperthwaite
  • Modified zeolite catalysts
    Patent number: 4983560
    Abstract: There is disclosed a method for the modification of a natural clinoptilolite by acid treatment using a mineral acid at a suitable temperature and for a suitable period of time, followed by calcination, to produce a modified clinoptilolite which may be used as a catalyst in a reaction for the preparation of or transformation of hydrocarbons, e.g. the cracking of hydrocarbon products. There is also disclosed a method of regenerating the deactivated modified catalyst after use by treatment in the presence of nitrous oxide.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: January 8, 1991
    Assignee: Pratley Investments (Proprietary) Limited
    Inventors: Richard G. Copperthwaite, Themistoclis Themistocleous, Graham J. Hutchings