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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7513167 | Single-fracture method and apparatus for automatic determination of underground stress state and material properties An improved single-fracture method and apparatus for determining the ambient stress state and material properties of underground media includes, in one aspect, an expandable probe having high-strength steel shells with longitudinally extending, tooth-like ridges to ... | 04/07/2009 |
| 7441468 | Squeeze force measuring system A method of measuring the squeeze force of a package includes applying a compression force to the package, and measuring the compression force as a function of volume change of the package. The compression force may be applied by placing the package in a force teste... | 10/28/2008 |
| 7387031 | Method for monitoring corrosion damage to a metal sample A method of monitoring corrosion in a metal sample comprising applying a physical stress to one or more metal samples, placing the metal sample under stress in a sealed vessel, adding one or more fluids to the vessel, measuring the strain on the metal sample over a ... | 06/17/2008 |
| 7380462 | Apparatus and method for measuring supporting force of large diameter ferroconcrete piles An apparatus measures a supporting force of ferroconcrete piles by means of a bi-directional front end oil pressure loading apparatus using a high pressure loading system capable of measuring a supporting force, a sinking amount and an axis load distribution on the ... | 06/03/2008 |
| 7325460 | Force sensor method and construction A method of making a force sensor, the force sensor being particularly sensitive the axial component of a force applied along a predetermined axis, of the type including a force-receiving membrane deformable by an applied force to be sensed, the method comprising: p... | 02/05/2008 |
| 7299686 | System and method for testing the compaction of soil A device for determining soil compaction includes a control member fitted with one or more sensors that measure the response of the control member during co-action between the control member and a soil surface. In one embodiment, this response can be flexure as char... | 11/27/2007 |
| 7280047 | Real-time electronic spray deposition sensor An electronic spray deposition sensor for sensing deposition of liquid on an exterior surface is disclosed. The deposition sensor has a sensing surface comprising a plurality of electrically conductive elements disposed across the sensing surface. The conductive ele... | 10/09/2007 |
| 7191664 | Testing of mechanical properties of materials Apparatus is disclosed for testing the mechanical properties of a material. The apparatus comprises a sample container (10) adapted to be filled with a sample of the material, and a housing (20) within which the sample container (10) is, in use,... | 03/20/2007 |
| 7143653 | Enhanced triaxial tester with volume change device for measurement of flow properties of dry cohesive particulate systems under low confining pressures Disclosed is a triaxial system for testing particulate matter under substantially dry triaxial load conditions comprising: a housing means fillable with confining fluid for providing confining pressure on a sample of dry particulate matter to be tested, the housing ... | 12/05/2006 |
| 7143654 | Methods and apparatus for detecting the presence, intensity, trajectory or location of a liquid stream An array of piezoelectric ceramic sensors affixed to a flexible plastic membrane forms a target surface and the signals produced by the sensors are processed to produce an output signal which indicates the location where a liquid stream strikes the target. The senso... | 12/05/2006 |
| 6612182 | Container and testing device for sport balls A container for storing sport balls incorporates a device for testing the playing condition of the balls. The test device is in the form of a disk with a base portion supported within the container and an indicator arm. A ball to be tested is placed into ... | 09/02/2003 |
| 6360613 | Container and testing device for sport balls A container for storing sport balls incorporates a device for testing the playing condition of the balls. A cylindrical container has a removable end cap that may be attached to the closed end of the container. A ball placed within the end cap is subjecte... | 03/26/2002 |
| 4697457 | Waste material compression tester A waste material compression tester is provided and having a reservoir or chamber for holding a sample of waste material containing liquid, a pressure source to apply pressure to the waste material under a pre-set pressure and a predetermined time period ... | 10/06/1987 |
| 4562726 | Method and apparatus for testing the compressibility of subterranean samples Compressibility test apparatus and method of testing compressibility. The apparatus includes a holder having a sample chamber for holding a sample in the environment of a confining pressure and means for supplying an internal pressure to the held sample. ... | 01/07/1986 |
| 4502338 | Triaxial apparatus for testing particulate material and method of using the same A triaxial cell apparatus for conducting constant lateral stress tests, constant volume tests and zero lateral strain tests on particulate materials. Pressure and volume measuring devices are in communication with a flexible inner specimen cylinder and wi... | 03/05/1985 |
| 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 |
