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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 |
| 4852397 | Field indentation microprobe for structural integrity evaluation Apparatus and methods for the in-field measurement of mechanical and physical properties of metallic structures. The apparatus is a Field Indentation Microprobe (FIM) using an indenter that is caused to contact and indent the structure using cyclically ap... | 08/01/1989 |
| 4776202 | Apparatus and methods for testing surface properties of a material An apparatus for testing the surface properties of a material is disclosed. The apparatus includes an indentor which is suspended above the surface of a sample and dropped onto the sample. Several testing methods are also disclosed. Surface toughness is m... | 10/11/1988 |
| 4649735 | Test device and method for testing foam material A device for testing a sample of foam material and a method for making such a test include compressing the sample repetitively by means of a dropped weight. The weight includes a plunger which moves vertically in a sliding bearing arrangement. The plunger... | 03/17/1987 |
| 4640119 | Utility pole tester An apparatus for testing the strength of the sidewalls of hollow tubular members such as for example metal utility poles is disclosed. The present invention provides a self-contained mechanically actuated testing device which is operable to subject a pole... | 02/03/1987 |
| 4581922 | Method of and device for obtaining the peak value of a signal and application to a method of and device for determining the hardness of a soil A method of obtaining the peak value of a signal. The signal is sampled at certain intervals of time. The value of the sampled signal is compared subsequent to sampling with a value previously stored in a memory. The higher of the two compared values is s... | 04/15/1986 |
| 4565089 | Consistometer An improved consistometer has a vertically-movable rod for imparting a precisely-measurable amount of energy on initial impact to a dough sample. Simultaneously, a precise measurement of vertical drop is obtained from a cooperating dial displacement indic... | 01/21/1986 |
| 4542639 | Testing of structures by impact Apparatus and method for testing structures by impact. The structure is struck by an impactor associated with a force transducer the output of which is related to the force which the transducer experiences on impact and encompasses a frequency range inclu... | 09/24/1985 |
| 4534206 | Strike diagnosis apparatus The present invention relates to an insulation diagnosis technique for the coil of a generator or the like, especially a strike diagnosis apparatus for diagnosing the good or bad condition of insulation by comparing, directly or after a suitable processin... | 08/13/1985 |
| 4531400 | Method and apparatus for ice impact testing A method and apparatus for impact testing ice in a laboratory environment simulates in-situ conditions wherein an ice sample is confined triaxially and maintained at a controlled temperature to approximate a semi infinite mass. An impact device impinges o... | 07/30/1985 |
| 4499906 | Percussion instrument A percussion instrument suitable for use in dental practice for determining the degree of looseness of teeth has a movably seated ram which is accelerated to a defined velocity by an electromagnetic drive means and is subsequently moved toward a test subj... | 02/19/1985 |
| 4444045 | Hand-operated hardness meter The hardness meter is so designed as to render the applied measurement load independent from the force that the operator is capable to exhert and as to provide an instantaneous load permitting a precise measure even if the equipment is shifted during the ... | 04/24/1984 |
| 4270383 | Method and apparatus for measuring strength characteristics An apparatus and method for measuring the flow stress and like characteristics of metals and other material especially at hot working temperatures. The specimen is struck simultaneously by projectiles of equal mass but unequal velocity. The velocities of ... | 06/02/1981 |
| 4250742 | Method and apparatus for testing hardness of homogeneous materials A powder-actuated apparatus for determining the hardness of various homogeneous materials wherein the determination may be made in a manufacturing facility, warehouse, or in the field. The apparatus ensures that a constant driving force will be delivered ... | 02/17/1981 |
| 4236402 | Method and apparatus for testing rock tenacity A method for performing strength tests on material to be mined includes the steps of preparing a flat surface on the material to be tested, forming one or more grooves in the flat surface, impacting the flat surface with a test device at a predetermined a... | 12/02/1980 |
| 4195512 | Coal-shale interface detector A coal-shale interface detector for use with coal cutting equipment consisting of a reciprocating hammer having an accelerometer mounted thereon to measure the impact of the hammer as it penetrates the ceiling or floor surface of a mine. Additionally, a p... | 04/01/1980 |
| 4182163 | Method and apparatus for measuring the strength of a fibrous body The strength of a material is measured by positioning a tool against a surface of the material and driving an elongated piercing plug having a blunt front end into the material. The penetration depth of the piercing plug is proportional to the material st... | 01/08/1980 |
| 4157655 | Coal-shale interface detection system A coal-shale interface detection system for use with coal cutting equipment consisting of a reciprocating hammer having an accelerometer mounted thereon to measure the impact of the hammer as it penetrates the ceiling or floor surface of a mine. Additiona... | 06/12/1979 |
| 4154084 | Coal-shale interface detection A penetrometer for coal-shale interface detection for use with coal cutting equipment consisting of a reciprocating hammer having an accelerometer mounted thereon to measure the impact of the hammer as it penetrates the ceiling or floor surface of a mine.... | 05/15/1979 |
| 4111039 | Apparatus for measuring the hardness of rubber In apparatus for measuring the hardness of rubber of the type wherein a needle is urged against the surface of a rubber sample and the degree of penetration of the needle is measured there are provided a coil spring, a lever for causing the needle to comp... | 09/05/1978 |
