Company Filing History:
1 out of 3,081 
1 out of 8,684 
1 out of 1 Years Active: 1977-1988
Title: The Innovative Contributions of Donald L. Cronin
Introduction
Donald L. Cronin is a notable inventor based in Anaheim, CA, with a significant impact in the field of electrical engineering. He holds a total of 4 patents, showcasing his innovative spirit and technical expertise. His work primarily focuses on power modulation and electronic ballasts, which are essential in modern electrical applications.
Latest Patents
One of Cronin's latest patents is the "Power Filter Resonant Frequency Modulation Network." This invention is designed for coupling between a load and a variable voltage direct current power source, which is subjected to superposition of alternating current at various frequencies and voltage levels. The filter includes first and second series inductor arrangements in the positive and negative buses, with capacitive elements in parallel. Each series inductor arrangement features a first inductor in series with a frequency and voltage responsive inductive load device, which is a second inductor with a tertiary winding loaded with a coil wound around the core of a saturable reactor. The firing angles of the reactors are directly proportional to voltage and inversely proportional to voltage, providing a phase staggered change of inductance in the network. At higher frequencies and lower voltages, the loading reactors are out of saturation, presenting a very high impedance to the circuit, resulting in a broadening of the normal high Q peaking within a range of frequencies at resonance.
Another significant patent is the "Electronic Ballast Having Emitter Coupled Transistors and Bias Circuit." This electronic ballast is designed for energizing fluorescent lamps and includes a converter with a rectifier and filter for converting alternating source voltage into direct current voltage. The network comprises first and second switching transistors, a tank circuit with a primary winding of a transformer, and a secondary winding for providing feedback of a portion of the voltage developed across the tank circuits. The bias circuit is coupled between the opposite ends of the secondary winding and the emitters of the transistors, serving to convert direct current voltage into an amplified sinusoidal voltage with high frequency, powering fluorescent lamps connected in a series configuration across the primary winding.
Career Highlights
Throughout his career, Donald L. Cronin has worked with various companies, including TRW Limited. His contributions to the field have been recognized through his patents, which reflect his commitment to advancing technology in electrical engineering.
Collaborations
Cronin has collaborated with