Ralph A. Logan — 13 Patents at AT&T

Ralph A. Logan has been granted 13 US patents while listed as an inventor at AT&T. The first was granted in 1980 and the most recent in August 1991. Ralph A. Logan ranks #362,438 of 4,157,543 US inventors in our database (top 8.7%). Patent records list Ralph A. Logan in Morristown, NJ, US.

Patents per Year

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Showing 1–13 of 13 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
5040186	InP-based quantum-well laser	Tawee Tanbun-Ek, Henryk Temkin	1991-08-13
4953170	Method for forming a heteroepitaxial structure, and a device manufactured thereby	Tawee Tanbun-Ek, Henryk Temkin	1990-08-28
4701995	Method of making a nonplanar buried-heterostructure distributed-feedback laser	Gerald Dolan, Henryk Temkin, Daniel Paul Wilt	1987-10-27
4627065	Double active layer semiconductor laser	Won-Tien Tsang	1986-12-02
4575919	Method of making heteroepitaxial ridge overgrown laser	Won-Tien Tsang	1986-03-18
4536940	Method of making a loss stabilized buried heterostructure laser	Charles H. Henry	1985-08-27
4481631	Loss stabilized buried heterostructure laser	Charles H. Henry	1984-11-06
4464211	Method for selective area growth by liquid phase epitaxy	Won-Tien Tsang	1984-08-07
4390889	Photodiode having an InGaAs layer with an adjacent InGaAsP p-n junction	Federico Capasso, Albert Lee Hutchinson	1983-06-28	$20,928,000
4269635	Strip buried heterostructure laser	Won-Tien Tsang	1981-05-26	$27,192,000
4226667	Oxide masking of gallium arsenide	—	1980-10-07	$11,181,000
4194933	Method for fabricating junction lasers having lateral current confinement	Won-Tien Tsang	1980-03-25	$22,161,000
4190813	Strip buried heterostructure laser	Won-Tien Tsang	1980-02-26	$9,445,000

Ralph A. Logan — 13 Patents

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