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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 4702110 | Method and apparatus for measuring metal hardness utilizing longitudinal and transverse ultrasonic wave time-of-flight The present invention is a method and apparatus for measuring the average hardness of a metal. This method capitalizes on the discovery that a longitudinal wave will travel roughly twice as fast as a transverse (shear) wave, the times-of-flight of the two... | 10/27/1987 |
| 4692300 | Device for the underwater measurement of the hardness of a vertical wall of the partitioning of the core of a pressurized water nuclear reactor The invention relates to an underwater measuring device of the hardness of a vertical wall of the partitioning of the core of a pressurized water nuclear reactor. The device comprises a hollow pole for the manipulation from the edge of the pool of the rea... | 09/08/1987 |
| 4676094 | Roll-firmness measuring device A measuring device for determining the pressure zone width and/or surface pressure between a web roll for a web and a further roll of a winding apparatus includes at least one reflex sensor emitting a radiation towards the web roll and receiving radiation... | 06/30/1987 |
| 4658631 | Friability drum tester for pharmaceutical tablets A tester of resistance of separate batches of tablets to breakage including a revolvable cylinder revolvable around a central height axis that extends axially of the cylinder, cylindrical space formed therein being divided into separate spaces by dividing... | 04/21/1987 |
| 4653314 | Article and method having subsurface property gradient determination capability An annular bead or other protuberance is provided on the outside of a bearing or other part on a non-critical surface so that the protuberance can be case hardened in the same manner as critical surfaces of the part and provide a degree of hardness at eac... | 03/31/1987 |
| 4638657 | Device for measuring the winding hardness of a strip, especially a strip of paper, wound into a reel A device for measuring the winding hardness of a strip, especially a strip of paper, that has been wound into a reel. The device consists of a mechanism for extracting a slip that has been inserted tight between two coils of the reel of paper with one end... | 01/27/1987 |
| 4635471 | Hardness testing device for pipes A hardness tester for pipes comprising a positioning mechanism that presents the pipe to a multiple purpose testing head having a pre-programmed proportional control configuration that independently engages the pipe and determines the pipes relative posit... | 01/13/1987 |
| 4590802 | Measuring apparatus for measuring the degree of compaction of a material The invention is directed to a measuring apparatus for determining the degree of compaction of material for building dams, roads or the like after the material has been compacted with a suitable compaction machine. The measuring apparatus includes a vibra... | 05/27/1986 |
| 4555028 | Apparatus for compression testing and sorting golf balls An apparatus for testing the compressability of golf balls and sorting them in accordance with predetermined compression ratings. The apparatus includes a golf ball movement path having a rotary anvil on one side thereof for driving the golf balls one at ... | 11/26/1985 |
| 4548081 | Ultrasonic softness testing system The softness of paper as a function of the number of bonding sites per unit area of the paper is determined by directing ultrasonic energy toward the paper and determining the magnitude of the portion of reflected energy.... | 10/22/1985 |
| 4542646 | Tablet hardness tester An improved tablet hardness tester includes a ram and anvil for fracturing a tablet therebetween, a support for holding a tablet in position for fracturing between the ram and anvil, a strain gauge for measuring the force exerted by the ram in fracturing ... | 09/24/1985 |
| 4512180 | Pellet durability tester A pellet durability tester is provided which establishes the durability of manufactured pellets by subjecting them to circulation in a closed air re-circulation path and establishing the weight ratio of whole pellets in the sample before and after testing... | 04/23/1985 |
| 4503865 | Hardness measuring probe This invention discloses a hardness measuring probe making it possible to continuously and quickly measure the hardness around an object position by a simple operation. The pressure around the object to be measured is led from an aperture to one pressure ... | 03/12/1985 |
| 4472960 | Method of and apparatus for testing properties Method of and apparatus for testing required properties of the specimen solids such as tablets, pills, granules, capsules, etc. automatically and continuously. After nondestructive tests are performed, then destructive tests are performed automatically an... | 09/25/1984 |
| 4467652 | Procedure and device for compaction measurement The invention refers to a procedure and a device for measuring the degree of compaction attained when compacting a foundation by means of a vibrating compaction tool. The movement of that part of the compaction tool which rests on the foundation is sensed... | 08/28/1984 |
| 4448079 | Process for determining the force acting on a test piece and the resultant change in parameters and a device for carrying out such a process To determine the force acting on a test piece and the resultant change in parameters, the test piece is subjected to linearly increasing force. The resultant change in parameters and the force needed for this purpose are measured continuously and compared... | 05/15/1984 |
| 4435975 | Apparatus and method for cutting a flat surface on a metallic member Apparatus for cutting a flat surface on a metallic member may comprise: a frame assembly including a clamping device on which a metallic member may be placed for clamping the metallic member in a firmly fixed position; a broach frame mounted on the frame ... | 03/13/1984 |
| 4419885 | Method of verifying the stress rolling of a metallic rim A method of verifying the stress rolling of a metallic rim includes the steps of taking a first hardness reading of the surface that is to have been stress rolled, taking a second hardness reading of a reference surface that has not been stress rolled and... | 12/13/1983 |
| 4359841 | Grinding wheel wear detection and dressing method An improved method and apparatus senses the extent of actual wear of a grinding wheel at an area where the wear will be the greatest during the grinding of a workpiece. The grinding wheel is dressed by removing material from the grinding wheel to an exten... | 11/23/1982 |
| 4318297 | Pendulum-type film hardness measurement tester A novel automatic test measuring apparatus of the pendulum variety for readily and easily determining film and the like hardness is adapted to automate all the operations necessarily preceding the commencement of a measurement stage using, in connection t... | 03/09/1982 |
| 4154095 | Apparatus for indicating the deflection characteristic of a hollow ball having an internal pressure A method and apparatus is disclosed for adjusting the resilience of a hollow ball having an internal pressure. A ball, particularly a tennis ball, is held in a confined position. A mixture of inflating medium and sealant material is injected from an aeros... | 05/15/1979 |
| 4140008 | System for testing firmness A system for measuring or testing the firmness of a resilient object such as a mattress. A pressure applying platen or the like is driven by a motor into the object, and the pressure applied is measured through the utilization of a pressure sensitive tran... | 02/20/1979 |
| 4114350 | Method and apparatus for adjusting the resilience of a hollow ball having an internal pressure A method and apparatus is disclosed for adjusting the resilience of a hollow ball having an internal pressure. A ball, particularly a tennis ball, is held in a confined position. A mixture of inflating medium and sealant material is injected from an aeros... | 09/19/1978 |
| 4022056 | Hardness testing apparatus Hardness testing apparatus is provided having a pair of anvil elements adapted to receive and hold a test object which may then be subjected to increasing pressures by application of an increasing force to one of the anvil elements while holding the other... | 05/10/1977 |
| 4007632 | Apparatus for determining the textural qualities of food A punch and die test cell device for use in combination with a compression orce measuring instrument in the testing of food products to determine their textural qualities, such as toughness or tenderness. Also, a method of evaluating the textural qualities... | 02/15/1977 |
| 3979948 | Apparatus for determining the dynamic complex hardness of resilient roll coverings Apparatus for determining the dynamic complex hardness of resilient roll coverings including a portable housing for positioning directly on the resilient roll covering to be tested. The portable housing includes an adjustable probe coupled to force and di... | 09/14/1976 |
| 3955406 | Non-destructive hardness testing of articles such as cigarettes Apparatus for the non-destructive hardness testing of an article such as a cigarette. The article is placed in an elastic sleeve and surrounded by a liquid, the level of which may be determined through a gauge tube. The interior of the article is then sub... | 05/11/1976 |
| 3943757 | Tablet hardness tester and method of testing A method of testing the hardness of a circular tablet is presented and comprises holding the tablet on edge between two members respectively on opposite sides of the tablet, transmitting a controlled pressure to the tablet through one of the members, tran... | 03/16/1976 |
| 3931732 | Sharp edge tester A hand held tool for testing the sharpness of edges to determine the presence or absence of a safety hazard in which a rotatable mandrel is driven by a torque spring at a specified velocity for a single rotation, the mandrel carrying a covering of testing... | 01/13/1976 |
| 3930406 | Cigarette ends firmness detector A device for detecting the degree of firmness of cigarette ends comprising a rotating drum moving laterally one after the other to a position to be tested, yieldable feeler means with indicator means positioned according to the firmness of a cigarette end... | 01/06/1976 |
