This inventor holds 3 USPTO granted patents. Top assignees: Rf Products, Inc., Research Fuels, Inc.. Active years: 1978-1980.
Company Filing History:
Years Active: 1978-1980
Title: Innovations by John A. Callahan
Introduction
John A. Callahan is an accomplished inventor based in Houston, TX. He holds a total of 3 patents that showcase his innovative contributions to technology. His work primarily focuses on advancements in digital price encoding and ticket printing systems.
Latest Patents
One of his notable inventions is the Gasoline Pump Digital Price Encoder. This device is designed to deliver pulses corresponding to the price of gasoline or other liquid petroleum products dispensed by a pump. The encoder is removably mounted on the existing mechanical price computer in the pump. It includes an input gear that engages a drive gear on the computer. A pulse generator coupled to the input gear provides pulses at a higher rate than required for the output. This pulse rate is then reduced by a counter to provide a desired number of pulses per unit price. The counter is reset in response to the application of operating power to eliminate errors that might arise when the pump is reset.
Another significant invention by Callahan is a Ticket Printer. This apparatus features a motor equipped with a centrifugal speed governor, opposing ticket rollers, and a ticket transport tray. It rolls a blank, multipage ticket form past seven needle printing heads that are solenoid actuated. The ticket to be printed is inserted into the transport tray and engages a motor-operated switch, which rotates certain ticket rollers at a governed speed. The ticket advances, pinched by opposing rollers, and moves beneath the seven parallel needle printing heads. It also actuates a print start switch that initiates electronic operation. The ticket continues its advance while being printed for N digits until it disengages the motor start switch, allowing the drive motor to expel the ticket from the tray and printer.
Career Highlights
Throughout his career, John A. Callahan has worked with several companies, including RF Products, Inc. and Research Fuels, Inc. His experience in these organizations has contributed to his development as an inventor and innovator in his field.
Collaborations
One of his notable coworkers is Allan S. Ottenstein, with whom he has collaborated on various projects.
Conclusion
John A. Callahan's contributions to the fields of digital price encoding and ticket printing demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to improving technology and enhancing user experience in practical applications.