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:
Jan. 20, 1998
Filed:
Apr. 16, 1996
Brian J Wurtz, Levittown, PA (US);
Abar Ipsen Industries, Inc., Bensalem, PA (US);
Abstract
A vacuum heat treating furnace includes a pressure vessel having a wall that defines a chamber wherein metal parts are vacuum heat treated. A fan is disposed inside the chamber for circulating a cooling gas therein. An electric motor is mounted externally to the pressure vessel for driving the fan. A drive shaft interconnects the fan and the electric motor through an opening in the wall of the pressure vessel. The vacuum furnace incorporates a dual seal for providing a vacuum-tight seal and a gas-tight seal where the drive shafts passes through the pressure vessel wall. The dual seal includes an inflatable seal surrounding the drive shaft for providing a vacuum-tight seal around said drive shaft when the furnace chamber is evacuated to a subatmospheric pressure. The dual seal also includes one or more lip seals surrounding the drive shaft adjacent to said inflatable seal for providing a gas-tight seal around said drive shaft when the furnace chamber is backfilled with a superatmospheric pressure of the cooling gas and while the drive shaft is rotating.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile