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:
Jul. 18, 1978
Filed:
Jun. 14, 1976
Richard L Ruggles, Mount Baldy, CA (US);
Vinod Panday, Covina, CA (US);
Clemar Manufacturing Corporation, Glendora, CA (US);
Abstract
Apparatus, and a related method, for proportionately varying from a master unit the durations of irrigation at a plurality of valve stations controlled by a number of satellite units, and for transmitting over a single pair of wires control signals for starting a programmed sequence of valve operations at all of the satellites in a selected one of two groups of satellites, or for resetting all of the satellites to a 'home' position. One disclosed embodiment includes adjustable timing circuitry in the master unit to generate a timing signal which is transmitted to the satellite units over a separate wire, and is utilized to vary the duty cycle of a station timing motor which measures the durations of irrigation. In an alternate embodiment, station timing at each satellite is measured by means of a digital pulse counter, and the irrigation times at all of the stations can be varied to the same degree by adjustment of a variable-frequency pulse generator at the master unit.