Abstract: A scanning receiver includes an Electrically Erasable Programmable Read Only Memory (EEPROM) as massive nonvolatile storage for frequency control words. The receiver includes a microprocessor based receiver controller which executes data base management routines to manipulate the data base which is partitioned into scan banks of multiple frequency selection words and search banks of two limit frequency selection words. The software includes routines which can add or delete frequencies, change banks, control the scanning order of the banks, provide priority to a selected bank, and other functions. The EEPROM, to maintain its longevity, is only written to if bank of frequencies is changed while in the RAM of the receiver controller. After a bank of frequencies is changed in RAM, it is sorted in descending order so that a rapid slewing of the local oscillator frequency can be implemented in a single direction.

Abstract: At a telephone subscriber's premises, call identification apparatus is used to determine whether incoming calls are intended for a primary telephone station or for a secondary telephone station. The call identification apparatus monitors electrical signals present on a telephone line after the call has been answered by one of the secondary telephone stations in search of a predetermined identificattion signal. In response to the presence of the identification signal from an originating source, the apparatus disconnects all secondary stations from the telephone line, terminates the incoming call by hanging up, and dials a predetermined telephone number. After dialing the predetermined number, an authentication procedure is invoked which requires that the dialed station transmit a security code to the apparatus. If the dialed station incorrectly transmits the security code more than N times, the call is terminated.

Abstract: A painting apparatus has a peristaltic pump having a pump cavity in a pump body and a pumping tube in the cavity. The cavity is provided with an elongate drain passage. A photoelectric sensor is arranged to receive light from a light source, both being associated with the drain passage to sense any leakage of paint from the pumping tube draining into the drain passage and to thereupon stop the pump. An alert light may be provided for signalling that paint leakage has stopped the pump. Preferably, a funnel-like transparent container is removably fitted in the cavity below the pumping tube to receive the paint leakage. The container has a spout-like downward extension engaged in the drain passage but allowing transmission of light to the photoelectric sensor.

Abstract: A paint roller is provided with a removable sleeve receiving a cover having a pile on a stretchable flexible backing. A reversible, speed controllable pump on a hand cart provides paint to the roller from a supply under control of a switch at the roller handle. The roller handle contains a radio transmitter for transmission of pump control signals to a receiver in a pump housing mounted to the hand cart. A peristaltic pump is used for the pumping, and is reversible to facilitate draining of the system back to the paint source. Opening of a door on the pump housing releases pump roller pressure from pump tubing, provides access to pump rollers and pump tubing, and thereby facilitates installation and removal of the pump tubing. Conventional water hose fittings are provided to facilitate cleaning by connection to a hose bib of a domestic water system, if desired.

Abstract: A paint roller is provided with a removable sleeve receiving a cover having a pile on a stretchable flexible backing. A reversible, speed controllable pump on a hand cart provides paint to the roller from a supply under control of a switch at the roller handle. The roller handle contains a radio transmitter for transmission of pump control signals to a receiver in a pump housing mounted to the hand cart. A peristaltic pump is used for the pumping, and is reversible to facilitate draining of the system back to the paint source. Opening of a door on the pump housing releases pump roller pressure from pump tubing, provides access to pump rollers and pump tubing, and thereby facilitates installation and removal of the pump tubing. Conventional water hose fittings are provided to facilitate cleaning by connection to a hose bib of a domestic water system, if desired.

Abstract: A paint roller is provided with a removable sleeve receiving a cover having a pile on a stretchable flexible backing. A reversible, speed controllable pump on a hand cart provides paint to the roller from a supply under control of a switch at the roller handle. The roller handle contains a radio transmitter for transmission of pump control signals to a receiver in a pump housing mounted to the hand cart. A peristaltic pump is used for the pumping, and is reversible to facilitate draining of the system back to the paint source. Opening of a door on the pump housing releases pump roller pressure from pump tubing, provides access to pump rollers and pump tubing, and thereby facilitates installation and removal of the pump tubing. Conventional water hose fittings are provided to facilitate cleaning by connection to a hose bib of a domestic water system, if desired.

Abstract: A transceiver channel selection circuit operable in both transmit and receive modes of operation including a digital phase lock circuit having a controllable oscillator, a reference frequency source, and means for obtaining a signal, the frequency of which is an aliquot part of the controllable oscillator frequency, are connected together in a feedback loop and the reference frequency and submultiple frequency compared and the controllable oscillator frequency changed, if the submultiple and reference frequencies differ.

Abstract: A voltage variable filter circuit useful, for example, in a radio frequency transmitting device and having a center frequency which is changeable with changes in an applied voltage employs one or more voltage variable reactive elements in the filter in conjunction with circuitry for changing the direct current voltage across such reactive elements to change the reactance thereof and therefore also change the center frequency of the filter. To extend the range of filter variation, additional reactance may be selectively introduced into the filter circuit. In the environment of a multi-channel radio frequency transmitting device, a selector switch simultaneously selects one radio frequency channel for transmission and a unique voltage source for application to the voltage variable reactance so that the filter is appropriately tuned for the selected channel.