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 |
| 7314237 | Pipe joint assembly A pipe joint assembly including a transparent quill; an outer quill having at least a first view port, and having at least a first outwardly extending pipe coupling thread which extends longitudinally along and helically about the outer quill, the transparent quill ... | 01/01/2008 |
| 7290441 | Micro slit viscometer with monolithically integrated pressure sensors An improved micro slit viscometer includes a combined micrometer depth rectangular slit flow channel with monolithically integrated multiple pressure sensors in the flow channels and a pumping system that injects a test sample to the channel at a desired flow rate. ... | 11/06/2007 |
| 7237431 | Apparatus and method for measuring viscosity An apparatus and methods for analysis of a petroleum product, specifically determining the viscosity of a sample, are disclose. The apparatus includes a sample reservoir for receiving a liquid sample and a pressure regulator for applying hyperbaric pressure to a sam... | 07/03/2007 |
| 7131318 | Viscometer A viscometer including a thermal block, a thermo device to control temperature of the thermal block, a temperature sensor to sense temperature of the thermal block, a capillary tube embedded in the thermal block such that the capillary tube is in thermal contact wit... | 11/07/2006 |
| 6418792 | Pressure compensated transducer A pressure compensated sound transducer is provided wherein compensation and equalization of static ambient pressure variations occurring on the faces of at least one piezoelectric element is achieved by a mensural compensating duct communicating compensa... | 07/16/2002 |
| 5661233 | Acoustic-wave sensor apparatus for analyzing a petroleum-based composition and sensing solidification of constituents therein An acoustic-wave sensor apparatus and method. The apparatus for analyzing a normally liquid petroleum-based composition includes at least one acoustic-wave device in contact with the petroleum-based composition for sensing or detecting the presence of con... | 08/26/1997 |
| 5481903 | Method and instrument for viscoelastic measurements An apparatus for measuring viscoelastic properties of rubbery materials is disclosed. The instrument comprises two opposed dies having temperature and pressure controling means, means for initiating oscillatory rotation of one of the dies whereby the samp... | 01/09/1996 |
| 4466275 | Arrangement for measuring viscosity An arrangment for measuring the viscosity of a fluid includes a heated, vertical container which receives a vessel filled with the fluid to undergo a viscosity determination. A pair of vertically spaced sensors are mounted in the peripheral wall of the co... | 08/21/1984 |
