David M. Embree — 6 Patents at AT&T

David M. Embree has been granted 6 US patents while listed as an inventor at AT&T. The first was granted in 1985 and the most recent in November 1990. David M. Embree ranks #779,687 of 4,157,543 US inventors in our database (top 18.8%). Patent records list David M. Embree in Reading, PA, US.

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #	Title	Co-Inventors	Date
4973922	Voltage controlled variable capacitor and oscillator using it	Shawn M. Logan	1990-11-27
4887053	High frequency VLSI oscillator	Shawn M. Logan	1989-12-12
4853655	High frequency CMOS oscillator	Shawn M. Logan	1989-08-01
4567333	Electronic tone ringer with distinctive signaling circuitry	David C. Goldthorp, Howard H. Longenecker, David R. Vogelpohl	1986-01-28
4508937	Method and circuitry for encoding telephone ringing signals	William A. Burger, Martin H. Singer, David R. Vogelpohl	1985-04-02
4491691	Electronic tone ringer	David C. Goldthorp, Howard H. Longenecker, David R. Vogelpohl	1985-01-01

David M. Embree — 6 Patents

Issued Patents All Time

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