Inventor · disambiguated record
Ralph A. Logan
Also filed as: LOGAN RALPH A · LOGAN RALPH ANDRE
21 granted patents·493 citations·filing 1974–1990
96Inventor score
Top patents by PatentIndex Score
21 records- 0190US4093345ASemiconductor rib waveguide optical modulator with heterojunction control electrode claddingBELL TELEPHONE LABOR INC·Filed 1976·Granted Jun 6, 1978·67 cites·19 claims
- 0290US3993963AHeterostructure devices, a light guiding layer having contiguous zones of different thickness and bandgap and method of making sameBELL TELEPHONE LABOR INC·Filed 1974·Granted Nov 23, 1976·42 cites·20 claims
- 0384US4159452ADual beam double cavity heterostructure laser with branching output waveguidesBELL TELEPHONE LABOR INC·Filed 1978·Granted Jun 26, 1979·30 cites·17 claims
- 0484US3978426AHeterostructure devices including tapered optical couplersBELL TELEPHONE LABOR INC·Filed 1975·Granted Aug 31, 1976·52 cites·8 claims
- 0582US4136928AOptical integrated circuit including junction laser with oblique mirrorBELL TELEPHONE LABOR INC·Filed 1977·Granted Jan 30, 1979·52 cites·11 claims
- 0672US4575919AMethod of making heteroepitaxial ridge overgrown laserAT & T BELL LAB·Filed 1984·Granted Mar 18, 1986·25 cites·13 claims
- 0771US5040186AInP-based quantum-well laserAT & T BELL LAB·Filed 1990·Granted Aug 13, 1991·31 cites·10 claims
- 0871US4269635AStrip buried heterostructure laserBELL TELEPHONE LABOR INC·Filed 1979·Granted May 26, 1981·18 cites·9 claims
- 0968US4226667AOxide masking of gallium arsenideBELL TELEPHONE LABOR INC·Filed 1978·Granted Oct 7, 1980·22 cites·6 claims
- 1067US4390889APhotodiode having an InGaAs layer with an adjacent InGaAsP p-n junctionBELL TELEPHONE LABOR INC·Filed 1980·Granted Jun 28, 1983·23 cites·18 claims
- 1163US4701995AMethod of making a nonplanar buried-heterostructure distributed-feedback laserAMERICAN TELEPHONE & TELEGRAPH·Filed 1986·Granted Oct 27, 1987·13 cites·5 claims
- 1259US4194933AMethod for fabricating junction lasers having lateral current confinementBELL TELEPHONE LABOR INC·Filed 1979·Granted Mar 25, 1980·16 cites·9 claims
- 1358US4190813AStrip buried heterostructure laserBELL TELEPHONE LABOR INC·Filed 1977·Granted Feb 26, 1980·16 cites·21 claims
- 1458US4169997ALateral current confinement in junction lasersBELL TELEPHONE LABOR INC·Filed 1977·Granted Oct 2, 1979·16 cites·9 claims
- 1557US4953170AMethod for forming a heteroepitaxial structure, and a device manufactured therebyAT & T BELL LAB·Filed 1989·Granted Aug 28, 1990·15 cites·9 claims
- 1656US3935472AThin film liquid waveguide optical converterBELL TELEPHONE LABOR INC·Filed 1975·Granted Jan 27, 1976·13 cites·10 claims
- 1749US4464211AMethod for selective area growth by liquid phase epitaxyAT & T BELL LAB·Filed 1982·Granted Aug 7, 1984·14 cites·7 claims
- 1847US4481631ALoss stabilized buried heterostructure laserAT & T BELL LAB·Filed 1981·Granted Nov 6, 1984·7 cites·10 claims
- 1946US4028146ALPE Technique for fabricating tapered optical couplersBELL TELEPHONE LABOR INC·Filed 1976·Granted Jun 7, 1977·11 cites·11 claims
- 2044US4627065ADouble active layer semiconductor laserAT & T BELL LAB·Filed 1983·Granted Dec 2, 1986·6 cites·13 claims
- 2139US4536940AMethod of making a loss stabilized buried heterostructure laserAT & T BELL LAB·Filed 1984·Granted Aug 27, 1985·4 cites·6 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →