David W Haldeman, 67633 Grant St, Santa Monica, CA 90405

6867604, Mar 15, 2005

Jun 28, 2002

10/186815

David P. Haldeman - Broomfield CO, US
Edde Tin Shek Tang - Louisville CO, US

International Business Machines Corporation - Armonk NY

G01R027/08
H02J007/00

324705, 320137

A circuit for measuring voltage of a battery or group of batteries whose terminals are not directly accessible. The battery or group of batteries can have three leads. First and second leads are connected to the voltage output of the battery and the third lead is connected to the return of the battery. The three leads may terminate in a three prong plug which may plug into a printed circuit board to form a module. The module can be connected into a rack via an edge connector. A battery voltage measurement circuit can be located on another printed circuit board which is also plugged into the rack. This other printed circuit board may be interconnected to the battery module by wire traces within the rack. Thus, there are one or more first connectors between the first lead of the battery or group of batteries and the charger. There are one or more second connectors between the second lead of the battery or group of batteries and an input of the voltage measurement circuit.

7676730, Mar 9, 2010

Dec 29, 2005

11/322446

Rodger D. Haugan - Broomfield CO, US
Galen G. Kerber - Lafayette CO, US
David P. Haldeman - Broomfield CO, US

Quantum Corporation - San Jose CA

G11C 29/00
H03M 13/00

714769, 714766

Apparatuses and methods for utilizing error correction code in a data buffer or data storage device. In one variation, a single memory device is utilized to store both the data and the associated error correction code. The data and the associate error correction codes are stored on separate memory banks on the memory device. The error correction code may be consolidated into one or more regions on the memory device to improve the utilization of the available memory space on the memory device. In addition, by utilizing separate memory banks to store the data and the associated error correction code, the data and the error correction code can be accessed in an overlapping manner.

5146588, Sep 8, 1992

Nov 26, 1990

7/617574

Michael R. Crater - Arvada CO
David P. Haldeman - Broomfield CO

Storage Technology Corporation - Louisville CO

G06F 1108

395575

The data storage subsystem of the present invention uses a large plurality of small form factor disk drives to implement an inexpensive, high performance, high reliability disk drive memory that emulates the format and capability of large form factor disk drives. The data transmitted by the associated computer system is used to generate redundancy information which is written with the data across N+M disk drives in a redundancy group in the data storage subsystem. To clear the redundancy accumulator memory, an associated pointer memory is used to indicate the ones of the redundancy accumulator memory byte positions that were used in the previous redundancy calculation. As data is received from the computer system, the pointer memory is checked to determine whether this next byte position need be reset to erase the previously stored redundancy calculation residue. If not, the data is simply stored therein.

4480217, Oct 30, 1984

Dec 14, 1982

6/449735

David C. Robbins - Jefferson County CO
David Haldeman - Denver CO
John P. Hill - Adams County CO
Charles Sander - Boulder County CO
James Touchton - Boulder County CO

Storage Technology Corporation - Louisville CO

G05B 501

318618

An automatic velocity calibrator for a head positioning servo system in a magnetic disk drive performs a velocity calibration in a single pass over the magnetic disks by measuring actuator velocity and adjusting the gain of the velocity transducer in a series of successive approximations. Velocity is determined by turning a timer on in response to a track crossing and turning the timer off after at least two successive track crossings have been detected. A plurality of velocity measurements are stored and averaged. The average velocity is compared to a constant velocity command and an 8-bit latch is incremented or decremented in response to this comparison. A digital to analog converter produces a reference for an automatic gain control amplifier in the servo system which in turn adjusts the velocity transducer gain.

5404361, Apr 4, 1995

Jul 27, 1992

7/919897

Anthony J. Casorso - Westminster CO
David P. Haldeman - Broomfield CO

Storage Technology Corporation - Louisville CO

H03M 1300

371 401

The dynamically mapped data storage subsystem generates a two error correction, three error detection code of extent sufficient to cover not only the data but also the corresponding memory address for each data record stored therein. The error correction code is transmitted and stored with the data within the data storage subsystem to ensure the integrity of both the data and its memory address.