Patents by Inventor Christoph Thoma

Christoph Thoma 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).

  • Infrared objective
    Patent number: 5812309
    Abstract: The invention relates to an infrared objective (IR objective) with a lens arrangement for the production of an infrared image on a detector element of infrared detector equipment. In this respect it may be a question of a focal plane array (FPA) within a Dewar vessel with an internal cold shield for substantially preventing access of thermal radiation from the surroundings (spurious light fractions). The internal cold shield is placed behind an external uncooled cold shield comprising several staggered external cold diaphragms.
    Type: Grant
    Filed: April 4, 1996
    Date of Patent: September 22, 1998
    Assignee: Steinheil Optronik GmbH
    Inventors: Christoph Thoma, Matthias Erdmann, Johann Schweiger, Karl Pietzsch
  • Method for producing buried regions of raised refractive index in a glass member by ion exchange
    Patent number: 4842629
    Abstract: An improvement for a method of producing buried regions of raised refractive index in a glass member by ion exchange characterized by removing a titanium mask from the glass member after a first ion exchange to raise the refractive index of exposed portions of the glass member with an EDTA disodium etching solution followed by a slight material erosion of the glass after removal of the titanium mask prior to an implementation of a second field-assisted ion exchange.
    Type: Grant
    Filed: November 12, 1987
    Date of Patent: June 27, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventors: Peter Clemens, Herbert Michel, Christoph Thoma