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:
Nov. 20, 1990
Filed:
Feb. 02, 1989
Colin D Schauder, Murrysville, PA (US);
Tac H Nguyen, Denville, NJ (US);
Inventio AG, Hergiswil, CH;
Abstract
A feedback controlled elevator system driven by a traction drive motor in response to a speed pattern provided by a car controller. The speed pattern is limited when the car approaches a terminal floor within a predetermined terminal slowdown zone adjacent to the terminal floor. A pattern limiting signal is provided in response to digital integration of shaft encoder signals which provides a digital position 'x' of the car within a terminal zone. The position 'x' of the car is then used to access a read-only-memory which contains the maximum car speed for the specific location of the elevator car. The value from the read-only memory is used to limit the speed pattern.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile