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| Number | Title | Issue Date |
| 5346129 | Indoor climate controller system adjusting both dry-bulb temperature and wet-bulb or dew point temperature in the enclosure A controller for a climate control system has a humidity (wet-bulb or dew point) temperature sensor as well as a dry-bulb temperature sensor within the enclosure. The humidity temperature value is used in connection with the dry-bulb temperature to genera... | 09/13/1994 |
| 5346128 | Humidity control system A humidity control system for a space receiving conditioned air from a duct has sensors which measure the current humidity in both the space and the duct. The system calculates a duct set point based on the difference between the current space humidity an... | 09/13/1994 |
| 5310585 | Decorative article made of preserved sprigs A decorative article of manufacture has a penetrable core into which the ends of sprigs are inserted. Leaves forming the ends of the sprigs preferably conceal the core completely. The sprigs include preserved leaves on the unsupported projecting ends whic... | 05/10/1994 |
| 5274334 | Calibrated physical parameter value measurement system A circuit for measuring a parameter value by measuring the time required to charge a capacitor in a sensor RC circuit from a first to a second voltage includes a reference RC circuit whose capacitor is also charged between two voltage levels. The circuit ... | 12/28/1993 |
| 5262752 | Electrical switch having a two stage snap action interface for enhanced operation An electrical switch assembly includes a snap action switch which is actuated from one to another conduction state by a snap action interface mechanism moved by an external actuation element between first and second corresponding positions. The snap actio... | 11/16/1993 |
| 5249739 | Apparatus and method for monitoring the operating condition of a burner system Apparatus and method for sensing the operating condition of a burner temperature as the indicating variable. When the operating status is stable, the flue temperature should be nearly identical to that when the system was known to be in proper condition. ... | 10/05/1993 |
| 5236328 | Optical flame detector performance tester A burner control system periodically tests for and detects an out of range signal level from a flame sensor in the burner. When the system is in standby operation where no flame is present, the control system checks whether the flame signal level is withi... | 08/17/1993 |
| 5233883 | Mechanical actuator with scales indicating the position at which a limit control element will be operated An actuator of the type having a limit switch for setting the range through which the actuator's output element moves, has a first element fixed to the output element and a second element carrying an actuation element for tripping the limit switch. Trippi... | 08/10/1993 |
| 5227639 | Infrared-based sensing circuit providing an output simulating the output of a flame rod sensor A converter circuit provides an output signal of polarity opposite that of an input signal having a DC component and a low frequency periodic component in response to presence of that input signal. Current is transferred from a first capacitor to a second... | 07/13/1993 |
| 5199637 | Electronic thermostat having correction for internally generated heat from load switching The apparatus controlling operation of a digital thermostat mounted in an enclosure corrects the internally measured temperature for heat generated within the thermostat enclosure by the switching element controlling operation of the load, typically a HVA... | 04/06/1993 |
| 5199323 | Apparatus for connecting a member to a shaft at any angular position Apparatus for fixing a member at any angular position to the non-circular cross section of a shaft has an insert formed of a relatively soft material and a clamping element fixed to the member. The insert has a central bore whose cross section matches the... | 04/06/1993 |
| 5199239 | Housing seal interface The joint between two nearly rigid, mating walls has a tongue on one wall's surface and a groove on the other wall's surface which have special cross section shapes cooperating to resist penetration of the joint by fluids such as water. At least one of th... | 04/06/1993 |
| 5194728 | Circuit for detecting firing of an ultraviolet radiation detector tube A driver circuit for an ultraviolet detector (UV) tube discriminates between firing of the UV tube in response to ultraviolet radiation impinging on it and a high resistance short between its output terminals. A capacitor charged on half cycles of AC powe... | 03/16/1993 |
| 5192874 | Interface circuit for low power drain microprocessor-based thermostat A microprocessor-based power switching circuit responds to a common form of noise by disconnecting power from the controlled apparatus. The microprocessor provides an alternating voltage when power is to be provided, and the alternating voltage is convert... | 03/09/1993 |
| 5182498 | Spring return rotary actuator A rotary actuator uses a two degree of freedom gear train with three torque members to provide torque to the output element from a first torque member. The torque is supplied to a second torque member from a drive motor. A torsion spring on the third torq... | 01/26/1993 |
| 5176945 | Transfer sheet for use in printing operations and having compensation for dimensional instability A transfer sheet for use in printing of patterns such as alphanumeric characters onto a keyboard or other workpiece from the transfer sheet where the patterns are originally formed has a realignment area in which a plurality of slits are formed. The slits... | 01/05/1993 |
| 5176037 | Linear actuator with controllable output force An actuator suitable for use with a valve has a design allowing for easy control or adjustment of the force applied to the valve. The actuator motor has a cam which operates a follower surface of a spring-loaded arm mounted for rotation on a carriage. The... | 01/05/1993 |
| 5170313 | Timed contact switch A timed contact switch apparatus has a conventional pushbutton placing a main switch in an actuated state when the pushbutton is depressed. A timing circuit is activated by the pushbutton to provide power to activate an electromechanical latch which holds... | 12/08/1992 |
| 5160853 | Electronic timer switch with time tracker A programmable timer for turning a light on and off in response to changing sunset, daylight savings time, and other programmable conditions. The programmable timer includes an input device, a microprocessor, and a switch. The input device provides calend... | 11/03/1992 |
| 5133656 | Fuel burner valve operator circuit with intermittent ignition A burner control system conditions opening of the fuel control valve on proper operation of a hot surface igniter for igniting the fuel. Current flow through and voltage across the hot surface igniter is constantly monitored, and if either is not proper, ... | 07/28/1992 |
| 5121880 | Mode selector for a heating system controller A heating system controller is suitable for controlling a heating system based on a plurality of sensed control signals representing control parameters. The heating system controller has a first input suitable for being coupled to provide a control signal... | 06/16/1992 |
| 5115968 | Method and apparatus for controlling a heating/cooling system based on a temperature error A temperature control system has a thermostat which provides an on/off signal. The on/off signal has an on period and an off period and is indicative of a temperature error. The temperature control system is suitable for controlling temperature control eq... | 05/26/1992 |
| 5108072 | Variable pressure electrically operated valve with an adjustable stroke-limiting mechanism for the actuator The moving coil actuator of a pressure regulator has two threaded adjustment screws each mounted parallel to the actuator's path and which project through a limit surface of a carrier for the moving oil actuator. Both adjusting screws can be rotated by me... | 04/28/1992 |
| 5085576 | Apparatus and method for detecting leaks in a system for delivering gaseous fuel A leak detector for a valve controlling flow of fuel to a combustion chamber employs a fuel concentration sensor in a sensing chamber placed downstream from the valve seat. The valve has a downstream chamber which is in communication by diffusion through ... | 02/04/1992 |
| 5081405 | Electrical actuator with means for preventing dither at a limit switch The tendency of a motor-driven actuator driving against a dynamic (non-frictional) load to return upon reaching the limit switch sufficiently to again close the limit switch and create a persistent oscillation at the limit position can be prevented by pla... | 01/14/1992 |
| 5073769 | Flame detector using a discrete fourier transform to process amplitude samples from a flame signal A circuit for detecting presence of a flame receives a flame signal from a standard photocell positioned to receive radiation from the flame and digitally processes the amplitude variations in the photocell's output to sense for the presence of frequencie... | 12/17/1991 |
| 5043722 | Detector for colliding signals in asynchronous communication A communications system has an active master node which transmits request messages in serial bit fashion on a data bus, and a plurality of responder nodes each of which receives the request messages on the data bus and may respond to a request message wit... | 08/27/1991 |
| 5039980 | Multi-nodal communication network with coordinated responsibility for global functions by the nodes An electronic network of communication and processing nodes particularly suitable for control of environmental systems has pluralities of the nodes which are sources for certain types of status messages each of which comprise communication of a particular... | 08/13/1991 |
| 5039010 | Relay-controlled anticipation in a two switch thermostat A conventional thermostat has separate high and low temperature switches for controlling a reversible motor driving a modulating damper or valve whose position controls the temperature of an enclosure by controlling the injection and removal of heat from ... | 08/13/1991 |
| 5035607 | Fuel burner having an intermittent pilot with pre-ignition testing A fuel burner includes an electrical igniter which lights a pilot burner which then lights the main burner. Operation of each of these steps is monitored, and if any are improper, the control device reverts to lighting the pilot burner with the main burne... | 07/30/1991 |
| 5034671 | Manual damper motor control The position of the power output member of a motor actuator which is normally controlled by a microprocessor in response to system-supplied condition signals may be set manually by providing a manually controlled selector signal to the microprocessor allo... | 07/23/1991 |
| 5028862 | Voltage follower circuit for use in power level control circuits A power control system includes a voltage follower circuit which may be interposed between a load power control circuit which adjusts the level of power applied to a load, and a variable impedance whose internal impedance prescribes the desired level of p... | 07/02/1991 |
| 5025984 | Setback thermostat with recovery start time selected non-linearly A setback thermostat controlling a device which holds and changes the temperature in a space includes the capability of sensing and recording the difference between the time at which recovery to a new setpoint temperature occurs and the selected time at w... | 06/25/1991 |
| 5020988 | Intermittent pilot type burner control with a single control relay A burner control system for an intermittent pilot burner system uses a single pole double throw relay to control first and second electromagnetic valves respectively supplying fuel for both burners and for the main burner only. The normally open contact p... | 06/04/1991 |
| 5015172 | Method and apparatus for detecting short circuited combustion air switches A method and apparatus detect a faulty air switch in a heating system which has an operation cycle comprising a plurality of operating periods. The air switch senses air flow in the heating system and causes air flow limit contacts to open when the air fl... | 05/14/1991 |
| 5004972 | Integrated power level control and on/off function circuit A load power control circuit which adjusts the level of power provided by a load in response to changes in the impedance across control terminals includes a control circuit which disconnects the load from the power source when the voltage across the contr... | 04/02/1991 |
| 5000222 | Tamper resistant adjustment range control for the adjustment screw of a control device A pressure adjustment screw for a fluid flow control device cannot for safety's sake be rotated within a threaded cylindrical bore on the device's body to withdraw it beyond an extreme pressure level safety setting. To allow field adjustment of the set po... | 03/19/1991 |
| 5000610 | Stop pin apparatus A stop pin which has a forward end and a latching end is employed between spaced plates or walls having aligned apertures. The latching end of the stop pin has locking buttons formed on longitudinal faces of the stop pin and a shoulder spaced from the loc... | 03/19/1991 |
| 4992040 | Airflow switch checking circuit A burner system has a control system which operates to prevent startup of the burner if an airflow switch indicates presence of combustion air flow before startup of a blower which provides the air flow. If the airflow switch later indicates absence of ai... | 02/12/1991 |
| 4963752 | Method for detecting missing circuit board components Empty component locations are detected on an assembled circuit board where the component locations are marked with spots of a fluorescent substance before assembly. The circuit board is exposed to stimulating radiation by a radiation source causing lumine... | 10/16/1990 |
