The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1992
Filed:
Feb. 26, 1991
Applicant:
Inventors:
Norman R Rowe, Chester, VA (US);
William R Sweeney, Richmond, VA (US);
Assignee:
Philip Morris Incorporated, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B08B / ; G02B / ;
U.S. Cl.
CPC ...
359509 ; 359507 ; 15405 ;
Abstract
Apparatus for preventing the deposition of dust on a surface, for example, the transparent surface of an optical instrument, is provided. The apparatus includes a tube and a hollow porous frustrum. The surface is placed inside the tube. The small opening of the frustrum is placed adjacent the surface, and the large opening of the frustrum is sealed against the inner wall of the tube. Compressed gas is flooded into the tube, passes through the frustrum and sets up a laminar gas flow away from the surface, thus preventing the deposition of dust on the surface.