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A kissing shield comprised of a thin, flexible membrane and a frame or holder.
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| Number | Title | Issue Date |
| 4314374 | High power audio frequency transmitter A high power amplitude modulated audio frequency transmitter having a Twin-T low frequency oscillator, a tickler coil high frequency oscillator, a switching regulator and a switching amplifier. The Twin-T low frequency oscillator produces a sine wave modu... | 02/02/1982 |
| 4238831 | Pulse interpolation method and apparatus Received periodic pulses of varying amplitude, representing a measured analog signal, are alternately applied to two interpolation channels through gates alternately activated by a flip-flop element responsive to each incoming pulse. Each channel converts... | 12/09/1980 |
| 4200855 | Bolt-like railway vehicle wheel detector A railway car wheel detection arrangement employing a pair of bolt-like sensor units which are spaced apart a given distance and are fastened to holes formed in the web portion of the track rail. Each of the sensor units includes an oblong aperture having... | 04/29/1980 |
| 4200856 | Differential clamp-on railway vehicle wheel detector A railway car wheel detection arrangement employing a pair of clamp-on sensor units which are spaced apart a given distance and are positioned on the upper surface of the base flange of the track rail. Each of the sensor units includes an elongated epoxy ... | 04/29/1980 |
| 4188002 | Vital power varistor circuit for railroad signaling systems A vital circuit network, equivalent to a two element, alternating current track relay used as a synchronous detector, has a first input transformer directly coupled across the local track circuit source and second input transformer coupled across the trac... | 02/12/1980 |
| 4181278 | Railroad interlocking signal system with insulated joint failure and overrun protection Insulated joint failure detectors are placed at each controlled signal location in the railroad interlocking to detect the condition of the insulated joints and also the passage of each truck of a train moving in either direction past that signal. Contact... | 01/01/1980 |
| 4180715 | Vital movable electricl contact arrangement A fail-safe multiple transfer contact assembly including a plurality of front, back and heel contact elements. The contact elements include elongated leaf spring members which are fixed to a molded insulative contact block. A silver contact button is rivo... | 12/25/1979 |
| 4177441 | Electromagnetic structure for a vital relay An improved electromagnetic relay structure employing a multiple coil U-shaped electromagnet, a flat spring biased armature and a single piece U-shaped metallic frame for providing a floating hinge joint and a teeter point for the armature whereby the mag... | 12/04/1979 |
| 4177459 | Fail-safe acknowledging circuit A fail-safe solid-state acknowledging circuit for a cab signaling system requiring an acknowledgment after the reception of a more restrictive speed command signal employing a plurality of transistor latching circuits having a predetermined order of more ... | 12/04/1979 |
| 4174508 | Relay latching apparatus A latching arrangement for a plug-in type of electromagnetic relay employing an insulative mounting sub-base for receiving an insulative relay base. An elongated leaf spring carried by the insulative mounting sub-base and having its ends protruding beyond... | 11/13/1979 |
| 4171788 | Power transfer apparatus for railroad track circuits At the remote end of a Type C track circuit, the conventional diode and the winding of a power transfer relay connected in multiple are connected across the rails over a transfer relay front contact. This transfer relay and the track relay at the near end... | 10/23/1979 |
| 4155526 | Railroad car wheel measuring apparatus A plurality of sensors, each generating distinct signals in response to the passage of leading and trailing edges of car wheels, are positioned along the rail at a height above the rail to detect the passage of a selected chord on the wheel tread. The dis... | 05/22/1979 |
| 4150417 | Fail-safe timing circuit This disclosure relates to a fail-safe timing circuit having a regulator which produces a regulated d.c. voltage when a switch is closed. A signal generator powered by the regulated d.c. voltage for producing square-wave signals. A two-stage amplifier for... | 04/17/1979 |
| 4145141 | Optical instrument for setting the position of a filament of a signal lamp An optical instrument for locating the focal point of a smooth surface concave reflector of a signal lamp unit. The optical instrument includes a cylindrical metallic base member for insertion into the electrical socket of a light bulb. A translucent sigh... | 03/20/1979 |
| 4136315 | Low and high frequency oscillators having common voltage regulator circuit A low frequency modulating signal and a high frequency carrier signal circuit employing a twin-T oscillator having an integrated circuit operational amplifier for producing the modulating signal and an L-C resonant feedback oscillator having a transistor ... | 01/23/1979 |
| 4130764 | Fail-safe or logic circuit A fail-safe "OR" logic gate circuit which includes at least a first and a second level detector each of which has a voltage breakdown device and an oscillating circuit, a resonant tank circuit connected in common with each of the oscillating circuits, an ... | 12/19/1978 |
| 4125784 | Fail-safe or gate A fail-safe "OR" logic gate circuit which includes at least a first and a second level detector each of which has a voltage breakdown device and an oscillating circuit, a separate resonant tank circuit each of which is tuned to substantially the same freq... | 11/14/1978 |
| 4118126 | Method of locating a light at the focal point of a concave mirror of a signal lamp unit A method of locating the filament of a light bulb at the focal point of a parabolic reflector comprising the steps of placing an optical instrument into the electrical socket for the light bulb, positioning the electrical socket and optical instrument unt... | 10/03/1978 |
| 4118774 | Locomotive speed control apparatus An analog speed error signal, developed by comparing actual and desired speeds, is processed into a control voltage through a two condition circuit network. When the error signal is more than a predetermined percentage of the desired speed, the network ha... | 10/03/1978 |
| 4117529 | Broken rail detecting track circuits Two sensor coils are positioned one adjacent each separate gage rail at the track relay end of a dual gage track section in which train detection current flows in the two gage, i.e., other than common, rails in parallel and returns through the common rail... | 09/26/1978 |
| 4099692 | Transfer apparatus for energy sources First and second monitoring channel apparatus detect the level of the normal output and load current, respectively, supplied by a principal energy source to a variable load network. Source output varies from normal to low level and load current from low t... | 07/11/1978 |
| 4088385 | Shielded connectors for closely spaced terminals All insulation is removed from a preselected length of the center conductor at one end of a short piece of coaxial cable. An adjacent portion of the outer jacket is also removed and the corresponding sheath folded back upon itself. A tubular contactor is ... | 05/09/1978 |
| 4088078 | Lubricating apparatus for reducing squeal noise of a railroad car wheel when passing through a car retarder Apparatus disposed in parallel relation to rails of a railway track section ahead or in advance of a railroad car retarder for applying a solid type lubricant to those areas of the car wheels frictionally contacted by the retarder and thereby suppressing ... | 05/09/1978 |
| 4079444 | D.C. to A.C. electronic inverter with overload protection A solid-state inverter having a programmed unijunction transistor oscillator for converting a d.c. supply voltage into a.c. oscillations which trigger a bistable transistor multivibrator for producing square-wave signals which are applied to a compound-co... | 03/14/1978 |
| 4067523 | Laterally adjustable adapter bracket for a grade crossing gate and signal assembly An adjustable adapter bracket for a railroad-highway crossing gate and signal installation for permitting the elongated gate arm to be shifted laterally to avoid interference with overhead obstacles. The adapter bracket is fixedly attached to the ends of ... | 01/10/1978 |
| 4066228 | Route control system for railroad interlockings A route oriented interlocking control system with only entrance, exit, and alternate route selectors on the control machine console. No track switch controllers or indications are provided at the control location. Operation of entrance and exit selectors ... | 01/03/1978 |
| 4064367 | Dual tone selector with answerback signalling A function control code sequence of signals, each comprising a pair of audio frequency tones, is transmitted from a control location to a remote station selector. Each input signal is applied to a tone decoder element which separates the two tones through... | 12/20/1977 |
| 4059845 | Fail-safe time delay circuit A fail-safe time delay circuit comprising a detection relay for sensing the presence and absence of an input signal, a switching relay for assuming a first and a second condition in accordance with the presence and absence of the input signal, and a progr... | 11/22/1977 |
| 4056739 | Fail-safe electronic polarized relay A fail-safe symmetrical solid-state polarized relay circuit having a positive and a negative level detector coupled to a source of periodic input signals. A pair of amplifiers for amplifying the a.c. oscillations produced by the level detectors. A plurali... | 11/01/1977 |
| 4046342 | Wayside signaling system for railroad cab signals and speed control A transmitter and a receiver are located at each junction location between adjoining track sections along a stretch of track for transmitting and receiving cab signal or speed control commands through wire loops laid in a preselected pattern parallel to a... | 09/06/1977 |
| 4044294 | Converter-regulator circuit arrangement This disclosure relates to a converter-regulator circuit which has high immunity to transient voltages and which employs a feedback controlled operational amplifier at the input end for controlling the conductive condition of an intermediate transistorize... | 08/23/1977 |
| 4044272 | Fail-safe electronic time delay circuit This disclosure relates to a fail-safe time delay circuit for providing a definite time interval. The time delay circuit includes a resistance-capacitance charging network which is connected to a source of a d.c. supply source by a switching device. The p... | 08/23/1977 |
| 4040121 | Fail-safe printed circuit board connection The external lead from a critical circuit element in a circuit component of a larger apparatus is connected to a first terminal or connector pad on a printed circuit board and at a more distant point on the lead to a second connector pad. The connection t... | 08/02/1977 |
| 4039920 | Cycling type of electronic battery charger This disclosure relates to a cycling type of a constant current electronically controlled battery charger having a reactive transformer, a full-wave rectifier, a series regulator and a sensing and control circuit for alternately supplying a low and high c... | 08/02/1977 |
| 4034365 | Most restrictive digital to analog converter This disclosure relates to an electronic converter circuit for a cab signal system employing a negative feedback type of operational amplifier and two banks of resistive and diode elements. One bank of resistive and diode elements electrically couples the... | 07/05/1977 |
| 4026506 | Transmitting loop arrangement for railroad cab signal and speed control system A wire loop for carrying cab signal or speed control commands is laid parallel to the rails along the track center line except at the exit end of each section where an offset portion of this loop is laid immediately adjacent one rail to form a cut-in sign... | 05/31/1977 |
| 4022407 | Railroad traffic control signaling system Separate traffic and block clear indication line circuits control either direction train movements through a stretch of track under cab signal indications without intermediate wayside signals. Reversible phase sensitive track circuits provide train detect... | 05/10/1977 |
| 4022408 | Track circuits with cab signals for dual gage railroads Alternating current track circuit energy for train detection and cab signals is coupled to the exit end of an insulated, dual gage track section between the common rail and the other two rails connected in parallel. The track relay is connected at the ent... | 05/10/1977 |
| 4009403 | Low gain pulse generating circuit This invention relates to a highly reliable and relatively noise immune electronic pulse generating circuit employing a low gain transistorized trigger circuit having its input coupled to a source of A.C. input signals and having its output coupled to a d... | 02/22/1977 |
| 4009454 | Fail-safe constant amplitude signal generator This disclosure relates to a fail-safe constant amplitude signal generator including a shunt regulator for supplying d.c. operating potential to a free-running transistor oscillator as well as for controlling the quality factor of a resonant tuned circuit... | 02/22/1977 |
