The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 1978
Filed:
Feb. 07, 1977
Joseph L Levasseur, St. Louis County, MO (US);
William A Seiter, St. Louis County, MO (US);
H. R. Electronics Company, High Ridge, MO (US);
Abstract
A control circuit for a pay phone including a coin unit where money is deposited and validated, an entry circuit having a first input connected to the coin unit for entry of amounts deposited, a second input to the entry circuit for communicating thereto call price information, a control element operable in response to deposits of an amount at least equal to the call price for enabling the customer to dial his call and to enable phone communication with the dialed phone, and apparatus to control payback of excess amounts deposited. The control circuit is preferably powered by a rechargeable energy source that may optionally be connected to the telephone line to derive charging current therefrom to maintain the charge on the energy source. The present control circuit may employ optical or other forms of couplers to establish connections to communicate the dialing mechanism and telephone handset with its associated transmission controls to the telephone line.