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:
Sep. 10, 2002
Filed:
Feb. 15, 2001
Michael D. Waterman, Chandler, AZ (US);
David W. Buck, Mesquite, TX (US);
Terry D. Morris, Buckeye, AZ (US);
James G. Winkel, Rockwall, TX (US);
David A. Crosby, Rowlett, TX (US);
Litton Systems, Inc., Los Angeles, CA (US);
Abstract
A transportable power source (P) for an image viewing device (D) includes a battery pack housing assembly ( ) to internally hold a first battery pack ( ). An electrical interface circuit ( ) receives an input voltage level ( ) and provides a resulting output voltage level ( ) as an output therefrom to operate the viewer device (D). The interface circuit ( ) receives a selected first input voltage level ( ) from the first battery pack ( ). Alternatively, the interface circuit ( ) receives a selected second input voltage level ( ) from a power supply source (S) external to the battery pack housing ( ). The interface circuit ( ) further includes a switch ( ) for selecting between sources of input voltage levels from among at least the first input voltage level ( ) and the second input voltage level ( ). The switch ( ) also selectively controls the source for the resulting output voltage level ( ).