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. 29, 2005
Filed:
May. 17, 2000
Teck Chye Allen Lim, Singapore, SG;
Khiam Yong Tan, Singapore, SG;
Teck Chye Allen Lim, Singapore, SG;
Khiam Yong Tan, Singapore, SG;
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
An apparatus and method for detecting the closure of one of several switches using a single input line of a detector is disclosed. The input line is also used to carry an audio-frequency signal when a recording switch is closed. The switches are connected to a network of resistors that cooperate with a pull-up resistor to form a voltage divider. The pull-up resistor is connected to the input line. The switches are closed to selectively switch resistors in the network out of the voltage divider to change the voltage on the input line. A detector reads the voltage on the input line and compares it with a set of predetermined values to determine which switch is closed. If a recording switch is closed, a microphone connected to the network of resistors converts sound to an audio-frequency signal onto the input line.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile