1
David R Parker, John H Gliever: Optical feedback isolator. Hewlett Packard Company, James M Williams, July 4, 1989: US04844593 (11 worldwide citation)

Method and apparatus for isolating optical feedback in a laser interferometer having a laser light source from which a linear polarized outgoing laser beam of certain polarization orientation is derived. The interferometer also redirects the outgoing laser beam to form a return laser beam directed t ...


2
John H Gliever, David C Chu: Measurement averaging counting apparatus employing a randomly phase modulated time base to improve counting resolution. Hewlett Packard Company, Theodore S Park, February 10, 1976: US03938042 (7 worldwide citation)

A measurement averaging counting apparatus employing a randomly phase modulated time base provides resolution improvement when measuring an applied signal comprising time intervals or pulsed frequencies repetitively occurring at rates synchronous to a counter's clock frequency.