T g Qt 9K1 DEFENSIVE PULICATION UNITED STATES PATENT OFFICE

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Published at the request of the applicant or owner in accordance with the Notice of Apr. 11, 1968, 849 O.G. 1221. Iden ti?cation is by serial number of the application and the heading indicates the number of pages of speci?cation, including claims, and of sheets of drawing contained in the application as originally ?led. The ?le of this application is available to the public for inspection; reproduction may be purchased for 60 cents per sheet. Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent O?ice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED APRIL 8, 1969 861 O.Gr. 367 573 227

TEMPERATURE DEVIA'i‘ION INDICATOR FOR PLURAL ‘CAPACITiVE TEMPERATURE SENSORS Paul Hugus Gaither IV, Claymont, and Chester Allen

Mellinger, Jr., Wilmington, Del., assignors to E. I. du Pont de Nemours and Company, Wilmington, Del., a corporation of Delaware Filed Aug. 18, 1966. Published Apr. 8, 1969 (Ilass 340—227

7 Sheets Drawing. 21 Pages Speci?cation This invention relates to a multi-position machine hav

ing temperatures controlled with capacitor temperature controllers of the type disclosed in US. Patent No. 3,112, 070. The device of the invention comprises a solid state

actuated, reed relay time sharing multiplexer for connect ing each controller sequentially, individually, ?rst to the input and then to the output terminals of a monitor. The

monitor comprises an assembly of logic circuit modules including a programmer to ensure the proper sequence of

operations; a memory to store characteristic standard fre quency value for each controller; a down-counter to com~

pute the magnitude and sign of the difference between the

actual frequency output of the controller and its frequency at set temperature; a limit set module to furnish tolerable

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limits to the above frequency difference; a compare module to furnish a signal when the frequency difference exceeds any of the set limits; and an indicate actuator module to furnish a positive or negative pulse back to the controller when the high or low frequency difference limit has been exceeded. In each controller there is provided an indica

tor lamp lighting circuit responsive to signals from the indicate actuator module such that one lamp is energized upon receipt of a positive pulse or another lamp for a

negative pulse.

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April 8, 1969

P. H. GAITHER |v. ETAL

DEF. PUB;

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DEF. PUB.

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