Patents by Inventor Carl T. Speiser

Carl T. Speiser 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 sealing anodically oxidized aluminium or aluminium alloy surfaces
    Patent number: 4588448
    Abstract: A process for sealing an oxidized aluminium or aluminium alloy surface comprising sealing the surface in the presence of a sealing agent to hinder the formation of a smut layer, the agent being the reaction product of one or more sulphonated aromatic compounds with an aldehyde and/or dimethylolurea or a mixture of formaldehyde and urea. A novel composition comprising the reaction product above and a cobalt or nickel salt may also be used as the above mentioned sealing agent.
    Type: Grant
    Filed: November 8, 1984
    Date of Patent: May 13, 1986
    Assignee: Sandoz Ltd.
    Inventors: Hans-Peter Baumann, Carl T. Speiser, Ernst Weisskopf