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:
Oct. 11, 1983
Filed:
Dec. 07, 1981
Hans-Joachim Forth, Cologne, DE;
Leybold Heraeus GmbH, Cologne, DE;
Abstract
A refrigerator cryostat for producing high vacuums at controlled temperatures in a sample chamber has first and second refrigerator stages for progressively lowering the refrigerator temperature to the sample chamber. An independent heater heats the sample chamber to provide, in combination with the refrigerator temperature, the controlled temperatures to the sample chamber. A vacuum pump preliminarily evacuates a casing about the refrigerator stages which is also in vacuum communication with the sample chamber, but a pumping surface in thermal communication with the first refrigerator stage and in the casing cryogenically augments the preliminary evacuation to the high vacuum levels necessary for operation of the refrigerator cryostat at sample chamber temperatures of, for example, from about 10.degree. K. to about 350.degree. K.