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| Number | Title | Issue Date |
| 4446361 | Aircraft flight computer The purpose of this invention is to provide an improved structure for a flight computer used by aircraft pilots. This improved computer structure is constructed of sheets of material fastened together in laminer fashion the outer surfaces containing formu... | 05/01/1984 |
| 4445416 | Player piano devices Improvements in player piano devices. Repetitive striking of a piano wire by a hammer head associated with a depressed piano key is accomplished by means of a rotating paddle that strikes a projecting portion of the hammer head attendant each revolution o... | 05/01/1984 |
| 4386264 | Till guards A guard for deterring thefts from open cash tills. The guard includes a pair of side barriers each of which, in use, projects from the till body in the direction of opening movement of the drawer so as to prevent direct side access to at least the rear of... | 05/31/1983 |
| 4371054 | Flow duct sound attenuator An acoustical silencer for a gas passage or exhaust duct for a gas turbine engine, which is composed of three parts. The first comprises an absorptive surface to absorb incident low frequency sound the second comprises an acoustically lined duct attenuati... | 02/01/1983 |
| 4371781 | Apparatus for interconnecting an actuator and a postage meter For interconnecting a postage meter and an actuator apparatus for operating the postage meter, wherein the postage meter includes a lever which is positionable in a plurality of postage value selecting positions, and the actuator includes a member for pos... | 02/01/1983 |
| 4366376 | Apparatus for interconnecting an actuator and a postage meter For interconnecting a postage meter and an actuator apparatus for operating the postage meter, wherein the postage meter includes a lever which is positionable in a plurality of postage value selecting positions, and the actuator includes a member for pos... | 12/28/1982 |
| 4366375 | Three-coin register toy bank A coin register toy bank adapted to accept and totalize coins of different size. Each coin is deposited in the receiver of a rotary drum mounted above a coin box, the drum being operatively coupled by an intermediate clutch plate to a register wheel havin... | 12/28/1982 |
| 4365536 | Sliding actuator membrane switch for organ keyboard An organ key assembly having a loosely mounted switch actuator providing self-aligning movement of the actuator relative to the switch. The switch, in the illustrated embodiment, is a membrane switch. The actuator is arranged to slide across the switch in... | 12/28/1982 |
| 4361753 | Process for interconnecting an actuator and a postage meter A process for interconnecting a postage meter and apparatus for operating the postage meter; wherein the postage meter includes a lever which is positionable in a plurality of postage value selecting positions, and the apparatus includes a member for posi... | 11/30/1982 |
| 4360076 | Muffler A muffler of the expansion type comprises an inlet pipe and an outlet pipe connected with each other through a main body. Minimization of pressure pulsation is achieved by a variety of means including appropriately-located apertures in those portions of t... | 11/23/1982 |
| 4354097 | Odometers An odometer for displaying the speed of a vehicle and the distance travelled, comprising an input shaft driven at a speed proportional to that of the vehicle, a speedometer unit connected to the input shaft, a mileage recording unit comprising a plurality... | 10/12/1982 |
| 4352407 | Diaphragms for acoustic instruments and method of producing the same A diaphragm for acoustic instruments such as speakers is produced by blending and kneading a thermoplastic resin such as polyvinyl chloride resin with graphite powder, rolling the blend into a sheet until graphite particles are oriented, and forming the s... | 10/05/1982 |
| 4350724 | Acoustic energy systems A passive system having high volumetric compliance in response to compressions and expansions, such as are present in low frequency acoustic wave energy, employs a saturated vapor-saturated liquid interface thermodynamically stabilized by distributed heat... | 09/21/1982 |
| 4350878 | Conception control calendar A calculating device is provided to aid in predicting the periods of fertility and non-fertility during a menstrual cycle of a user. The device includes a first disc having indicia thereon representing the calender days of the present month and the next m... | 09/21/1982 |
| 4350880 | Automatic fuel-cost monitoring system A system for budgeting fuel costs and for emitting an unwarranted-cost alarm based on instantaneous consumption, in a motor vehicle using liquid, gaseous, solid (or with adaptation, electrical) fuel includes an input drive to a counting meter showing accu... | 09/21/1982 |
| 4350331 | Sheet counting apparatus The invention relates to apparatus for counting flexible sheets comprising a support surface (15) for supporting a stack of sheets on edge including a rotary sheet removing assembly (5) mounted on an axis disposed at right angles to said support surface. ... | 09/21/1982 |
| 4348933 | Soundboard assembly for pianos or the like A soundboard assembly for use in a piano, harpsicord or similar stringed musical instrument comprises a thin, laminated soundboard consisting of a center sheet of wood and two outer layers of composite material. The center wooden sheet has a substantially... | 09/14/1982 |
| 4347911 | Acoustic headset An improved acoustic headset of the type used with sound reproduction equipment in airline entertainment systems. The headset has a yoke supporting a pin of curved sound-transmitting horns which terminate in soft tips for insertion in a passenger's ears. ... | 09/07/1982 |
| 4346783 | Apparatus for treating flowing working gases particularly to reduce the noise in operation thereof A device for treating flowing working gases in order to reduce their operational noises and in most instances also to increase their operating efficiency comprises a flowing working gas operating device which has a discharge conduit with at least one disc... | 08/31/1982 |
| 4345666 | Sound-damping assembly for a structure of a piece of furniture The assembly comprises a structural member, for instance one made out of wood, surrounded by a sheath member made out of rigid or semi-rigid plastic material, the outer contour of said core member and the inner contour of said sheath member being establis... | 08/24/1982 |
| 4346288 | Fuel saving aircraft descent calculator A manually operable calculator for optimizing aircraft fuel consumption during descent from an actual altitude to a target altitude/distance. Altitude and distance scales are provided which are alignable to determine an uncorrected fuel efficient distance... | 08/24/1982 |
| 4340809 | Security device and method for postage meter machines The present disclosure has to do with the prevention of the fraudulent alteration of postage meter tapes whereby they can be used without paying the proper postage. A simple locking device may be added to existing postage meters whereby the postage meter ... | 07/20/1982 |
| 4338848 | Piano action An action is described for musical instruments of the piano type. Means are included for braking and restraining each hammer of the action to prevent bouncing, rebounding, or other undesired movement, when the key is depressed and the hammer is positioned... | 07/13/1982 |
| 4338850 | Adjustable muffler for percussion instrument An adjustable muffler for a percussion instrument, such as a bass drum. The muffler includes a supple material which is situated contiguous to the head of the drum, one or more elastic strips to maintain the supple material in contiguous relationship with... | 07/13/1982 |
| 4339018 | Sound absorbing structure A plurality of parallel and laterally spaced impermeable walls define an array of side-by-side elongate fluid filled cavities. Adjacent open ends of the cavities provide a sound-receiving or admittance end for the sound waves into the cavities. An acousti... | 07/13/1982 |
| 4336863 | Silencer in gas flow passage The invention relates to an improvement of a silencer arranged in a gas flow passage of a gas supply or exhaust system and includes a sound absorbing material lined on wall surfaces of the gas flow passage in a duct casing. According to the invention, the... | 06/29/1982 |
| 4336861 | Speaker system An improved, compact speaker system for production of the full range of sound audible to the human ear, the sound radiating from the speaker being omnidirectional with the speaker including an outer cabinet shell and a defined chamber configuration within... | 06/29/1982 |
| 4337391 | Measuring device A device is provided for measuring a subject's reaction to stimuli, i.e., to measure a subject's indication of attitude, opinion, judgement, preference, evaluation, feeling, intention, etc. when presented with a question, problem, fact, situation or other... | 06/29/1982 |
| 4335801 | Noise suppressing nozzle Wall deflections of a multi-lobe type noise suppressing nozzle are minimized without the use of external struts and by the use of only a single internal strut per lobe. The lobes have either a substantially elliptical or substantially circular shape in cr... | 06/22/1982 |
| 4335874 | Sheet counting apparatus The invention relates to apparatus for counting flexible sheets contained in a stack, such as a pile of banknotes. The apparatus is of the type which has a rotary sheet removing assembly including a number of suction organs to which vacuum is applied in s... | 06/22/1982 |
| 4335300 | Diet control apparatus and method Apparatus for recording and visually indicating the consumption of nutrients which includes a frame having first and second elongated members disposed in spaced relationship and a plurality of wires intermediate the first and second members which are in g... | 06/15/1982 |
| 4333545 | Back-fire resistant lock seam for muffler shells A muffler wherein the shell comprises a metal sheet the ends of which are retained together in an interlocked joint has a shielding strip on the interior of the tube secured thereto in overlapping relation to the interlock. Preferably the sheet is a two p... | 06/08/1982 |
| 4331214 | Device to reduce the acoustical radiation from empty cans and containers during handling and transport in canning and related operations The acoustical radiation from handling empty cans and containers is reduced to sound levels which decrease the risk of hearing damage for exposed personnel by this invention. The invention comprises the temporary use of damping end-caps comprised of visco... | 05/25/1982 |
| 4331213 | Automobile exhaust control system An exhaust gas control system has a guiding pipe with a proximal inlet end for connecting to a distal end of an engine exhaust pipe. An expanding portion of the guiding pipe has a central rearward expanding cone and spiralling blades extending between the... | 05/25/1982 |
| 4329905 | Sound generating apparatus A portable apparatus (100) for mechanically amplifying voice and percussive sound includes a flared horn (10) with a horn mouth (26) and voice opening (28) for projecting sound in a desired directional sound radiation pattern. Within an opening formed in ... | 05/18/1982 |
| 4329570 | Lead calculator A calculating device and a method of use thereof for determining the lead required to shoot a projectile at a moving target including cooperating logarithmic scales with indicia corresponding to the parameters target speed, range, projectile speed and lea... | 05/11/1982 |
| 4327815 | Rotational mechanism disposed within fluid passageway A rotational mechanism to be disposed midway in a fluid passage may be utilized in a silencer, rotary pump, or the like. The mechanism is essentially provided with a casing defining a spherical chamber, a pair of shafts respectively having axes passing th... | 05/04/1982 |
| 4327817 | Method and apparatus for treating exhaust gases particularly for air-operated tools A muffler construction, particularly for exhaust gases of air-operated tools, comprises, a tubular sleeve having a passage therethrough, an exhaust gas pipe connected into the sleeve and defining a constricted flow passage with the sleeve, first and secon... | 05/04/1982 |
| 4326599 | Speaker bezel/retainer A speaker grille bezel-retainer terminating in a tubular portion with multiple groups of radially intermittent serrations axially displaced to receive a matching bezel ring having an inside diameter with alternate tabs and cut-outs and the tab is shaped t... | 04/27/1982 |
| 4325454 | Speaker system which inverts and redirects the speaker backwave A speaker housing includes an air-impermeable first chamber in which first and second speakers, each having diaphragms which vibrate in operation, are so mounted that the rear surfaces of the diaphragms of both speakers face the inside of the first chambe... | 04/20/1982 |
