Grid Systems Corporation

Sperry Rand Corporation

Lee A Watkins

Scott Kingsley Smader

Phillip T Nash

Harold S Long

Larry M Jacob

A rechargeable battery pack for a portable computer or other battery-powered device permits recharging of the battery while it is in the computer, or removal of the entire battery pack and recharging of the battery external to the computer by connecting an AC-DC converter directly to the battery pack. This permits removal of a battery pack and replacement with a charged battery pack, so that the portable computer is not occupied with battery charging and can be taken into the field while another battery pack is being charged. In the battery pack of the invention a DC power jack is located on the battery pack, identical to the DC jack on the exterior of the computer.

Externally rechargeable battery pack for a computer

A card housing attachment for adding industry standard add-on cards to a portable computer includes a card housing which is positioned on the top of the computer behind a tiltable display. A battery compartment slide-in structure slides into and out of a battery tray compartment opening in the back side of the computer and contains interconnect-card structure for developing the power and any clock required for the add-in card and for transmitting all necessary control signals and data lines between the add-on card and the computer bus.

Card housing attachment for a portable computer

A switching system for use with magnetic heads and providing protection for the read or write circuits while the other is being used and further substantially reducing any losses or distortion in the read signal when the circuit is switched to the read mode.

Growing community of inventors

San Jose, CA, United States of America

Lee A Watkins