Patents by Inventor Roland Henry Pratt

Roland Henry Pratt 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).

  • Gas laser and optical system
    Patent number: 6865211
    Abstract: An optical apparatus e.g. an interferometric displacement determination device: spectroscopic analysis apparatus; polarisation measurement apparatus; or a heterodyne frequency measurement device has a linear HeNe gas laser having an Ne content of an Ne20 isotope and an Ne22 isotope in substantially equal proportions, the apparatus in use having optical feedback toward the laser causing, 0.1% or more of the light output of the laser to be returned toward the laser (1). Use of this type of laser provides good polarisation stability even though excessive backreflection may occur, and hence the laser's frequency can be readily controlled.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: March 8, 2005
    Assignee: Renishaw, PLC
    Inventor: Roland Henry Pratt
  • Gas laser and optical system
    Publication number: 20020131467
    Abstract: An optical apparatus e.g. an interferometric displacement determination device; spectroscopic analysis apparatus; polarisation measurement apparatus; or a heterodyne frequency measurement device has a linear HeNe gas laser having an Ne content of an Ne20 isotope and an Ne22 isotope in substantially equal proportions, the apparatus in use having optical feedback toward the laser causing, 0.1% or more of the light output of the laser to be returned toward the laser (1). Use of this type of laser provides good polarisation stability even though excessive backreflection may occur, and hence the laser's frequency can be readily controlled.
    Type: Application
    Filed: January 25, 2002
    Publication date: September 19, 2002
    Inventor: Roland Henry Pratt