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| Number | Title | Issue Date |
| 5161521 | Oscillation degree measuring apparatus An oscillation degree measuring apparatus measures the fixing state of an object to be measured as a numerical value of the degree of oscillation and comprises an ultrasonic exciter for generating ultrasonic waves which shock the object and exciting oscil... | 11/10/1992 |
| 5142911 | Device for measuring the strength of pieces of compressed molding material A device for measuring the strength of pieces of compressed molding material. The device includes a probe pin and a stop surface arranged on the housing. On the end of the housing opposite the probe pin is arranged a cover for replacing batteries arranged... | 09/01/1992 |
| 5140857 | Friability testing apparatus The invention provides a friability testing apparatus which has an electrically excitable vibrator (10, 12) for vibrating a capsule (14) containing material to be tested. The apparatus includes a microprocssor (20) which proivdes an output waveform with a... | 08/25/1992 |
| 5092175 | Apparatus for testing hardness under load An apparatus for testing hardness under load has a measuring sensor in the form of a manual apparatus in which a mobile rod-shaped resonator can be slidingly inserted. The free end of the resonator, situated outside the housing, has a measuring tip. The r... | 03/03/1992 |
| 5003982 | Dynamic indentation system The dynamic indentation system cyclically indents a test material for the purpose of determining mechanical properties that cannot be measured directly, such as in-plane wall stress in intact hearts. A probe or an end surface thereof cyclically indents th... | 04/02/1991 |
| 4943930 | Method and apparatus for non-destructive evaluation of concrete The method and apparatus for the non-destructive evaluation of a concrete mass uses the maturity method for evaluating the strength and durability of the concrete mass. The apparatus employs sensors which are implanted in the concrete along with a micropr... | 07/24/1990 |
| 4904794 | Pyrazoline compounds New pyrazoline compounds of the formula ##STR1## in which X is 1,4-phenylene, ##STR2## if n is 1 or if R7 or R8 contains an SO3 M Radical, also a methylene or --CH2 CH(OH)--CH2 O-- group or ... | 02/27/1990 |
| 4869101 | Texture softness sensing Apparatus and method for use in measuring the softness of a fibrous product comprises a piezoelectric polymer film sensor, preferably polyvinylidene (di)fluoride with adhered opposed electrode surfaces, a sample of the fibrous product in direct contact wi... | 09/26/1989 |
| 4734846 | Apparatus for providing an indication of compaction in vibration compacting machines Method and apparatus for providing an indication of compaction in vibration compacting machines. A signal proportional to acceleration occuring when the working part of a vibrating compaction machine strikes soil is developed by means of an acceleration p... | 03/29/1988 |
| 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 |
| 4676379 | Apparatus for sorting out defective plastic crates for bottles An apparatus for discriminating and sorting out defective plastic bottle crates from sound bottle crates comprising driving means for urging an indenter or contact tip provided at the tip of a vibrating rod of an ultrasonic hardness tester into steady con... | 06/30/1987 |
| 4648081 | Circuit for automatic seabed discrimination A circuit automatically determines the nature of the seabed over which a vessel is passing, indicating via an audible or other warning signal when a fishing vessel is above a type of seabed which might damage the fishing net. The circuit is responsive to ... | 03/03/1987 |
| 4646571 | Method and apparatus for hardness measurement This invention discloses a method and apparatus for determining the hardness of a solid workpiece. An elongated rod is excited to be mechanically resonant along its longitudinal axis and is provided at its front end with a defined contact surface of hard ... | 03/03/1987 |
| 4620223 | Interferometric deformation analysis system Object deformations are analyzed by recording interferometric images using a television camera. The camera's photosensitive recording cathode is successively exposed to interferometric images of the object, respectively before and after a stress is applie... | 10/28/1986 |
| 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 |
| 4543827 | Method for measuring physical properties of material A method for measuring the physical properties of material comprising the steps of producing a tone burst wave by a tone burst wave oscillator, radiating acoustic energy of the tone burst wave onto an object to be measured to cause vibrations therein, det... | 10/01/1985 |
| 4523467 | Method and apparatus for resonant sensing device A resonant sensing device for measuring the hardness of a workpiece to be tested includes a diamond tipped rod adapted to be resonant and for determining the hardness of a workpiece to be tested is brought into forced contact with such workpiece. The diff... | 06/18/1985 |
| 4519245 | Method and apparatus for the non-destructive testing of materials A method and apparatus for the non-destructive testing of materials, particularly composite structures and other such laminated materials, which comprises repeatedly impacting the material being tested with a precisely regulated force having a pre-determi... | 05/28/1985 |
| 4502329 | Method for checking insulative condition of insulated windings used in electrical appliances The disclosure describes a method for checking an insulative condition of an insulated winding used in an electrical appliance comprising applying an external mechanical force to said insulated winding to give vibrating frequency to the same for its exami... | 03/05/1985 |
| 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 |
| 4227401 | Surface elevation measuring apparatus A terrain probe for sensing the elevation of a terrain surface whose prof is being measured and followed. A two-phase induction motor will raise or lower the terrain probe in response to either an increase or decrease in the elevation of the terrain surf... | 10/14/1980 |
| 4103554 | Method and a device for ascertaining the degree of compaction of a bed of material with a vibratory compacting device A device for ascertaining the degree of compaction of beds of material with a vibratory compaction device as a function of the vibratory amplitude of the motion of the compaction device at selected frequencies is described. The amplitude of vibratory moti... | 08/01/1978 |
| 4057051 | Hand held ear test probe A hand held ear test probe is disclosed for use in clinical evaluations of hearing problems. There are a number of important tests for evaluating hearing system losses which are based upon measurements taken in patients' external ear canals using a test p... | 11/08/1977 |
| 3958450 | Resonant sensing devices and methods for determining surface properties of test pieces Surface properties, such as, hardness, of a test piece are determined by holding a mechanical resonator, for example, in the form of a sensor rod against a surface of the test piece with a static force sufficient to maintain steady contact with the test p... | 05/25/1976 |
| 3955404 | Resonant sensing device The invention refers to a measuring circuit for determining the properties of a workpiece, particularly hardness, using the contact impedance method in which a probe resonating at an ultrasonic frequency provided with a workpiece engaging tip is utilized.... | 05/11/1976 |
