A signal device for a mailbox comprising a pivotally mounted, weighted arm which is received by the mailbox door in the closed position. When the door is opened, the arm is released, whereby the weight urges the arm away from the box and into the signalling position.

A signal coupler for coupling tone, voice and other signals to a pair of communication wires, such as the tip and ring leads of a telephone line is disclosed. The signal coupler comprises a gyrator, a capacitor and a controllable voltage source. The capacitor and controllable voltage source are series connected to the input of the gyrator. The controllable voltage source is modulated by the signal to be coupled and, in turn, modulates the input of the gyrator. The output of the gyrator is connec...

A method of signal analysis in which the signal in digital form has range values and domain values at successive turning points of range values stored in a memory; upon the signal passing through a penultimate stored value of range, the last two stored values of range and associated domain values are extracted for separate use and are deleted from the memory and hence from subsequent comparisons.

A tube of plastic or the like having a flexible bellows middle section and straight section ends with identifying indicia of color or shape thereon to represent information about garments contained on clothing hangers. It may have a flared section and a tapered section on opposing ends of the signal tube; the flared section to fit about the shoulders of a hanger and the tapered section to fit snugly about the neck area. The flared section may have locking nibs to help secure the signal tube to t...

A sign assembly for motorist comprises an accordion folded sign element with each fold having a given message and which may be folded to expose the desired message with the sign element being mounted within a similar foldable holder so that the sign assembly is foldable as a unit from an inoperative or folded condition to an operative or extended condition and vice versa.

A method of and a protection relay for protecting electrical equipment. The method includes dividing a predetermined dividend value by a signal corresponding to the load current in the equipment to provide a quotient signal, and then linearly integrating the quotient signal. When the integrated signal reaches a predetermined value, the equipment is tripped. This provides an overload vs tripping time characteristic which is substantially linear. The method further provides for sensing whether the...

A signal lamp having a light source, a reflector, and a dispersion sheet wherein the dispersion sheet is divided into a plurality of dispersion elements constructed so as to minimize the adverse effect of incident stray light and minimize or eliminate the occurrence of phantom light effect.

A rescue signal for use by a person in the water, consists of a tube of thin flexible material, at least about as long as the user's arm and as wide as his hand, inflatable by mouth, of a vivid color such as the international emergency orange. A flag of a similar but contrasting color may be fastened to the distal end. A lanyard for fastening to the user's garment is preferably included. The signal is folded into a compact package and is carried in a downward opening pocket on the user's outer g...

There is disclosed a signal transducer for extracting only the data components from information which has been modulated by different modulation systems. More concretely, the transducer provides two kinds of clock signals with respect to the information obtained by modulating the data under the frequency-modulation system or the modified frequency-modulation system, and extracts the data components from the information in accordance with one of the two kinds of clock signals.

The envelope of an input signal to be expanded is detected and applied via an adaptive filter to the gain control input of a variable gain device which expands the input signal. The adaptive filter provides improved ripple reduction and transient response characteristics and comprises a low pass filter for producing a smoothed control signal and an analog gate for coupling the greater of the smoothed control signal or a further signal to the variable gain device, the further signal being equal t...