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:
Jul. 24, 2007
Filed:
Jan. 30, 2004
Applicants:
Rory Smith, El Cajon, CA (US);
Hien T. Nguyen, Germantown, TN (US);
Inventors:
Rory Smith, El Cajon, CA (US);
Hien T. Nguyen, Germantown, TN (US);
Assignee:
Thyssen Elevator Capital Corp., Whittier, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66B 1/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
An improved system of variable speed drives that enhances the energy efficiency of an elevator system by enabling power transfer between the variable speed drives of two or more elevators via a common DC bus. Any combination of regenerative and non-regenerative variable speed drives may be used with the present invention. Energy storage devices may be connected to the common DC bus further improve efficiency.