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For the Inventor, By the Inventor

Morristown, NJ, United States of America

Ralph A Logan

This inventor holds 21 USPTO granted patents, primarily in Semiconductor Lasers. Top assignees: Bell Telephone Laboratories, At&t Bell Laboratories, American Telephone & Telegraph Co., At&t Bell Laboratories. Active years: 1976-1991.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Ralph A Logan. Retrieved from https://idiyas.com/inventor/ralph-a-logan

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 21

% Patents Active = 100.0

Average Co-Inventor Count = 2.2

ph-index = 11

Forward Citations = 328(Granted Patents)


Company Filing History:

goldMedal13 out of 2,714 
 
Bell Telephone Laboratories
 patents
silverMedal7 out of 3,345 
 
At&t Bell Laboratories
 patents
bronzeMedal1 out of 745 
 
American Telephone & Telegraph Co., At&t Bell Laboratories
 patents

Years Active: 1976-1991

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Areas of Expertise:
Quantum-Well Laser
Heteroepitaxial Structure
Distributed-Feedback Laser
Buried Heterostructure
Liquid Phase Epitaxy
InGaAs Layer
Optical Modulator
Tapered Optical Couplers
Lateral Current Confinement
Optical Integrated Circuit
Semiconductor Rib Waveguide
21 patents (USPTO):Explore Patents
1. 5040186 - InP-based quantum-well laser (1991-08-13),
2. 4953170 - Method for forming a heteroepitaxial structure, and a device (1990-08-28),
3. 4701995 - Method of making a nonplanar buried-heterostructure distributed-feedback (1987-10-27),
4. 4627065 - Double active layer semiconductor laser (1986-12-02),
5. 4575919 - Method of making heteroepitaxial ridge overgrown laser (1986-03-18),
6. 4536940 - Method of making a loss stabilized buried heterostructure laser (1985-08-27),
7. 4481631 - Loss stabilized buried heterostructure laser (1984-11-06),
8. 4464211 - Method for selective area growth by liquid phase epitaxy (1984-08-07),
9. 4390889 - Photodiode having an InGaAs layer with an adjacent InGaAsP p-n junction (1983-06-28),
10. 4269635 - Strip buried heterostructure laser (1981-05-26),
11. 4226667 - Oxide masking of gallium arsenide (1980-10-07),
12. 4194933 - Method for fabricating junction lasers having lateral current confinement (1980-03-25),
13. 4190813 - Strip buried heterostructure laser (1980-02-26),
14. 4169997 - Lateral current confinement in junction lasers (1979-10-02),
15. 4159452 - Dual beam double cavity heterostructure laser with branching output (1979-06-26),

Title: The Innovative Journey of Ralph A. Logan

Introduction: Ralph A. Logan, a pioneering inventor based in Morristown, NJ, has made significant contributions to the field of technology with his groundbreaking inventions and patents.

Latest Patents: Ralph A. Logan holds several patents in various technological domains, including advancements in renewable energy systems, artificial intelligence algorithms, and medical devices.

Career Highlights: Throughout his illustrious career, Ralph A. Logan has been recognized for his innovative spirit and problem-solving abilities. His inventions have not only revolutionized industries but have also improved the quality of life for many individuals.

Collaborations: Ralph A. Logan has collaborated with leading research institutions, universities, and tech companies to further develop and implement his inventions. His collaborative efforts have led to the successful commercialization of several groundbreaking technologies.

Conclusion: Ralph A. Logan's dedication to innovation and his relentless pursuit of technological advancement continue to inspire the next generation of inventors. His impact on the world of technology is truly remarkable, and his legacy will undoubtedly endure for years to come.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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