David M. Embree

AT AT&T: 6 patents #3,053 of 18,772Top 20%

AT American Telephone And Telegraph: 1 patents #132 of 699Top 20%

AL American Telephone And Telegraph Company, At&T Bell Laboratories: 1 patents #330 of 1,086Top 35%

BL Bell Telephone Laboratories: 1 patents #567 of 1,445Top 40%

Overall (All Time): #894,198 of 4,157,543Top 25%

Issued Patents All Time

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