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:
Jun. 29, 2004
Filed:
Aug. 20, 2002
Peter W. Gaudet, West Roxbury, MA (US);
Donald A. Olsen, late of Millis, MA (US);
Michael J. Eacobacci, Randolph, MA (US);
Helix Technology Corporation, Mansfield, MA (US);
Abstract
In a cryogenic vacuum pump, after determining that a power fail recovery mode is on, and that the temperature is below a setpoint, the cryopump is automatically cooled. If the power fail recovery mode is on, and the temperature is above the setpoint, a regeneration cycle is started automatically. If the power fail recovery mode is off, the cryopump may be maintained in an off state. When a command to turn on a pressure sensing thermocouple (TC) gauge is received, the TC gauge is turned on only if there is not a sufficient amount of gas to ignite. When a command to turn on a roughing valve is received, an additional command must be received before the roughing valve is turned on. When a temperature-sensing diode is faulty, temperature control is automatically turned off. During a regeneration cycle, a purge test is performed. If the purge test passes, heaters are turned on. If the purge test fails, the heaters are turned on only if the temperature reaches a threshold within a predetermined period. Otherwise, the regeneration is aborted.