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:
Sep. 17, 1985
Filed:
Dec. 08, 1983
Fuji Photo Optical Co., Ltd., , JP;
Abstract
A device for holding a measurement object e.g. in interferometers comprises a base plate and an attraction plate mounted on the base plate so as to attract the object placed on an upper surface of the attraction plate to the base plate together with the attraction plate by a vacuum applied via attraction grooves formed on the base plate and attraction passages perforated through the attraction plate. The upper surface of the base plate is formed as a reflection plane, and the attraction plate is made of a transparent material, so that Newton's rings generated by light reflected from the upper surface of the base plate and light reflected from the lower surface of the attraction plate can be observed from above the attraction plate.