Company Filing History:
3 out of 2,714 
2 out of 3,345 
1 out of 243 
Years Active: 1981-1986
Title: The Innovative Mind of David R. Vogelpohl
Introduction
David R. Vogelpohl, an esteemed inventor based in Indianapolis, IN, has made significant contributions to the field of electronics and signaling technology. With a portfolio that includes five patents, his innovative designs continue to shape how we experience audio signaling in telecommunications.
Latest Patents
Among his notable inventions, Vogelpohl's latest patents include:
1. **Electronic Tone Ringer with Distinctive Signaling Circuitry**: This invention pertains to an electronic tone ringer that enhances the ringing capability by utilizing two oscillators. This allows for the selection of four different tones and four distinct modulation rates. The device can generate tones using either frequency shift or amplitude modulation modes. When activated in frequency shift mode, two fundamental frequencies are produced, alternating based on predetermined ratios, complemented by selectable modulation rates. Conversely, amplitude modulation involves a single frequency that is switched on and off at the chosen modulation rate. The design ensures that all tones are capable of driving an electromagnetic acoustic transducer effectively.
2. **Method and Circuitry for Encoding Telephone Ringing Signals**: This patent details an innovative method to generate audibly distinct ringing codes. By alternately shifting between pairs of single frequency tones at varying modulation rates, the system creates distinguishable ringing patterns. Modifications in both modulation rates and tone frequencies further enhance the variety of codes produced, ensuring clearer and more identifiable ringing signals for users.
Career Highlights
David R. Vogelpohl has had an illustrious career, contributing his expertise at renowned institutions such as Bell Telephone Laboratories and AT&T Bell Laboratories. His work at these prestigious organizations has allowed him to make substantial advancements in telecommunications technology.
Collaborations
Throughout his career, Vogelpohl has collaborated with knowledgeable peers, including David C. Goldthorp and David M. Embree. These collaborations have facilitated a creative exchange of ideas, leading to the development of groundbreaking technologies in signaling systems.
Conclusion
David R. Vogelpohl's inventive spirit and dedication to advancing telecommunications continue to resonate within the industry. His patents not only demonstrate his technical prowess but also highlight his commitment to enhancing how we communicate through audio signaling. As technology evolves, the impact of his work will likely endure, inspiring future generations of inventors and innovators.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.