Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7246528 | Toner evaluation method, toner cartridge, and image forming apparatus A toner evaluation method that enables accurate evaluation of fixation performance of toner such as low temperature fixability and offset resistance, and a toner cartridge and an image forming apparatus adopting the toner positively evaluated by the evaluation metho... | 07/24/2007 |
| 7240545 | Test apparatus for direct measurement of expansion and shrinkage of oil well cements A test apparatus for the measurement of expansion and/or shrinkage of a cement test sample during curing under pressure and temperature conditions that simulate downhole oil well conditions isolates the test sample from a first fixed volume of incompressible pressur... | 07/10/2007 |
| 7121154 | Load sensor having hourglass-shaped coil spring A load sensor includes a load-input unit, an hourglass-shaped coil spring having one end coupled to the load input unit, a load-applying unit disposed at the other end of the hourglass-shaped coil spring, and a load detector for receiving the load from the load-appl... | 10/17/2006 |
| 6910386 | Method for testing flow characteristics of sealing materials A test method for determining, quantifying, and qualifying the flow characteristics of a sealant material compound comprising the steps of applying a uniform layer of known initial mass of sealant material between two test surfaces and compressing the sealant materi... | 06/28/2005 |
| 6568254 | Method for monitoring the creep behavior of rotating components of a compressor stage or turbine stage The present invention relates to a method for monitoring the creep behavior of rotating components of a compressor stage or turbine stage. In the method, at least one test element (2) is mounted in a region of the compressor stage or turbine stage in whic... | 05/27/2003 |
| 5877428 | Apparatus and method for measuring elastomeric properties of a specimen during a test procedure An apparatus for measuring elastomeric properties of a specimen during a test procedure includes a first compression member. The apparatus also includes a second compression member. Moreover, the apparatus includes a load cell having a body and a movable ... | 03/02/1999 |
| 5373744 | Compression tester Disclosed is a compression tester which is designed to simulate as closely as possible the low temperature conditions a cable is subjected to in an outdoor environment. Axially aligned composite sample members are compressed longitudinally while fitted in... | 12/20/1994 |
| 5284063 | Creep test coupon for metal matrix composites A test coupon for metal matrix composites is provided with means for structurally isolating the reinforcing fibers in the gage section from the reinforcing fibers in the clamped end regions of the coupon, when the latter is subjected to creep testing, so ... | 02/08/1994 |
| 5269190 | Apparatus for the performance of rheological measurements on materials A universal measuring apparatus for the determination of rheological properties of viscous, viscoelastic and purely elastic materials measures said properties solely by axial movement of the mechanical measuring components of the apparatus ("axial rheomet... | 12/14/1993 |
| 5205159 | Apparatus and method for measuring clot elastic modulus and force development on the same blood sample The compression elastic modulus of a blood sample is determined by compressing a blood sample (12) between plates (14 and 16) and comparing the voltage signal (32) output from the transducer (22) with a displacement calibration constant Cd. The... | 04/27/1993 |
| 5090249 | Apparatus and method for testing the mechanical properties of a sample Creep/recovery tests of a small sample are carried out on a conventional testing machine with vertical compression capabilities using an additional spring which allows the drive system of the testing machine to apply the force to the small sample substant... | 02/25/1992 |
| 4895750 | High-temperature tensile test specimen and methods of fabrication A carbon composite tensile test specimen for high temperature testing and a method of fabricating the same are disclosed. A plurality of holes are drilled in first and second end sections of the specimen and then the end sections are electroplated with ni... | 01/23/1990 |
| 4633718 | Method and apparatus for determining a stress relaxation characteristic of elastomeric materials under pressure A stress relaxation characteristic of an elastomeric material such as rubber and other elastomers under pressure is established by determining the ratio of the difference between two forces acting on a test sample before and after the test sample is store... | 01/06/1987 |
| 4569222 | Rolling caster floor tester An apparatus for testing the friction and susceptibility to damage by casters of various floor materials. A sample of floor material is moved under a caster wheel by a moving table. The caster orientation, pressure and size are variable. Forces on the cas... | 02/11/1986 |
| 4446743 | Method and apparatus for edgewise compression testing of flat sheets A compressive creep test fixture of box-like structure having a rectangular opening for testing a specimen and a pair of ports for applying a vacuum is provided. Rigid or semi-rigid elements, spaced from each other in a uniform manner, support the specime... | 05/08/1984 |
| 4432240 | Elastomeric testing apparatus In an apparatus for determining the amount of compressive force exerted on an elastomeric material, there is provided an elastomeric material retainer, compression apparatus cooperative with the elastomeric material retainer and compressive force measurin... | 02/21/1984 |
| 4393716 | Fixture for environmental exposure of structural materials under compression load The present invention relates to a device for stressing a deformable material specimen. The apparatus consists of top plate 11 and bottom plate 12 sandwiching a guide cylinder 13. The specimen 14 is positioned on the bottom plate 12 and attached to a load... | 07/19/1983 |
| 4343189 | Method and apparatus for edgewise compression testing of flat sheets A compressive creep test fixture of box-like structure having a rectangular opening for testing a specimen and a pair of ports for applying a vacuum. Rigid or semi-rigid elements, spaced from each other in a uniform manner, support the specimen at the rec... | 08/10/1982 |
| 4238952 | Method of determining characteristic rheological quantities of viscoelastic materials The invention relates to the determination of characteristic rheological quantities of viscoelastic materials by measuring specific parameters which permit assertions to be made on the properties of the material owing to their functional correlation with ... | 12/16/1980 |
| 4122704 | Portable variable expansion testing device for measuring lateral pressure induced on a material by a vertical applied pressure A portable testing device for directly measuring developed lateral pressure induced on a material by a vertical applied pressure while the lateral expansion is adjustable. The testing device comprises a thin-walled cylindrical sleeve-like receptacle which... | 10/31/1978 |
| 4103541 | Method of and a device for measuring a relaxation phenomenon A method of measurement of relaxation phenomena, in which input signals representing a relaxation phenomenon are recorded at equal intervals for logarithmic values of time. A measuring device for relaxation phenomena which comprises a logarithmic time pul... | 08/01/1978 |
| 4092843 | Apparatus for testing the readiness of heat-treated coal for moulding An apparatus for testing the readiness of heat-treated coal for moulding, said readiness being evaluated in terms of time as a span between the moment of exerting pressure on a test sample of heated coal and that of the beginning of the coal swelling, has... | 06/06/1978 |
| 4047425 | Testing device for measuring lateral pressure induced on a material by a vertical applied pressure A testing device for measuring a lateral pressure induced on a material by a vertical applied pressure, the testing device comprising in combination a material-holding receptacle which is capable of lateral expansion in response to a vertical applied forc... | 09/13/1977 |
| 4033181 | Method for destructionless proofing of viscoelastic products A test specimen is composed of an elastic part and a viscoelastic part. The elastic part is braced against a support. The viscoelastic part is connected to the elastic part and pulled to deform the elastic part, and in so doing itself undergoes deformatio... | 07/05/1977 |
| 3969928 | Non-destructive testing method for determining a body's mechanical properties and stresses The mechanical properties within a part are determined as a function of depth in a non-destructive manner by punching the body with a series of punches having different radii of curvature. Using a plastic criterion with the data obtained the elastic limit... | 07/20/1976 |
| 3933032 | Dynamic rheometer The dynamic mechanical properties of polymeric materials can be measured either in uniaxial compression or in flexure as a function of frequency over a wide frequency as well as temperature range, by using a piezoelectric driver to apply a displacement to... | 01/20/1976 |
