Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 5372031 | Device for vacuum testing of closed systems The vacuum tester has a housing which is small enough to be held in one hand in which is contained a small vacuum pump, an activator switch and a vacuum gauge. A non-return flap valve, or check valve, is disposed between the vacuum pump and the vacuum gau... | 12/13/1994 |
| 5365774 | Method of and apparatus for testing the seal of filled containers A method of and apparatus for the testing of containers, preferably in a filling closing machine for comestible products in plastic cups or the like. The container is received in a vacuum bell or chamber which is equipped with a suction cup at the end of ... | 11/22/1994 |
| 5353631 | Analyzing internal pressure of a sealed container using frequency spectra The internal pressure of a sealed container is characterized by tapping to vibrate a wall of the container, and then basing the characterization of the internal pressure on a frequency spectrum of the vibration and stored data measured from vibrating othe... | 10/11/1994 |
| 5307685 | Pressure tester and method of testing therewith Apparatus for, and method of, through-the-valve testing the pressure levels within pressurized containers, particularly aerosol containers, without dispensing the container contents. The apparatus includes a vertically reciprocal head in which a small cha... | 05/03/1994 |
| 5230239 | Package testing apparatus and method A apparatus and method of testing packages containing fluid materials for failure and leakage. The apparatus includes a plurality of testing stations in which a control assembly causes a series of actuators to advance platens so as to apply a given force ... | 07/27/1993 |
| 5199296 | Method for reducing test cycle time and for improving measuring accuracy at a leak testing process A method and test chamber for leak testing a container with a substantially flexible wall portion wherein the container is introduced into a test cavity so that the wall portion of the container is spaced from an inner adjacent wall portion of the test ca... | 04/06/1993 |
| 5029463 | Leak detection device for in-line measurement of package integrity A leak detecting device for a package having a plastic cover. Before sealing the cover, a gas containing five percent helium is introduced into the package. The package is placed beneath a hood which has an aspiration device to move the air within the hoo... | 07/09/1991 |
| 4953396 | Leak detector for containers A leak detection apparatus and method provides uniform pressure application for leak testing of irregular containers. The leak detector utilizes compressed air at a regulated low pressure and includes timing and pneumatic valve components for providing a ... | 09/04/1990 |
| 4930345 | System for checking seals in a packaging plant The seal of a package comprising a cup containing a liquid or semiliquid substance and having a rim to which a flexible cover is sealed is checked by simultaneously monitoring the position of the cover, inwardly elastically deflecting at least one of the ... | 06/05/1990 |
| 4901558 | Seal integrity tester and method The present invention is a method and apparatus for testing filled containers. The apparatus includes both a vacuum sensor and displacement sensors in combination. A computer is utilized to analyze the data from both the vacuum sensor and the displacement... | 02/20/1990 |
| 4864848 | Leak detection system The invention provides a leak detection system for filled and sealed pliable containers. The system comprises a continuous squeezing conveyor, a line conveyor and high and low fill level container content detectors located at predetermined positions. The ... | 09/12/1989 |
| 4862732 | Leak testing The leaky or non-leaky condition of a flexible, closed container is tested by increasing the pressure within the container (by causing motion of a wall of the container), and monitoring the resulting rate of change of a predetermined parameter (wall posit... | 09/05/1989 |
| 4756184 | Apparatus and method for seal testing flexible containers Disclosed are apparatus and methods for testing for leaks in bottles or containers having at least one flexible portion. The apparatus includes one or more test chambers including a means for applying a direct compressive force to the flexible container p... | 07/12/1988 |
| 4735508 | Method and apparatus for measuring a curvature of a reflective surface A method for measuring a curvature of a reflective surface includes the steps of directing a pair of collimated light beams onto a substantially smooth portion of the reflective surface and measuring the separation of the light beam images reflected from ... | 04/05/1988 |
| 4715215 | Method and apparatus for testing the fluid-tight sealed integrity of a hermetically-sealed package in a rapidly-stabilized environment A leak detector is adapted to test the fluid-tight sealed integrity of a hermetically-sealed package having a movable wall portion. An enclosure surrounds a package-to-be-tested, and the space within the enclosure is evacuated by a vacuum pump. As the pre... | 12/29/1987 |
| 4671101 | Package handling apparatus and method Apparatus for testing for leaks in flexible packages containing a product such as potato crisps and some air comprises three probing stations. Packages are transferred from station to station by suction cup heads carried on a reciprocable beam. Probes inc... | 06/09/1987 |
| 4649740 | Apparatus for and method of testing for leaks in packages Apparatus for testing for leaks in a flexible package containing loosely packaged product and some air includes a first set of gravitational probes at a first measuring station for applying a load to the package and obtaining a first measure of the thickn... | 03/17/1987 |
| 4593554 | Leak detection A method and an apparatus for detecting a possible leak in a vacuum package, in which the vacuum package is received within a wrapping wall at least essentially consisting of a gas-tight, flexible wrapping foil adapted for substantial adjustment to the co... | 06/10/1986 |
| 4539836 | Package leak tester A method and apparatus for testing packages for leaks. Selected values of suction and positive pressure are supplied to a testing position, which may be a test head. A package to be tested is held in the testing position by the suction, and positive press... | 09/10/1985 |
| 4517827 | Apparatus and method for testing for leakages in hermetically-sealed packages An apparatus and a method for the continuous, non-destructive testing for leaks in generally hermetically-sealed, flexible packages, which is adapted to rapidly detect leakages in vacuum from a plurality of packages contained within a closed case, to asce... | 05/21/1985 |
| 4188819 | Method and apparatus for sensing gas pressure in a container A check is provided of the gas pressure in a closed container having in its bottom wall a snap-action diaphragm of a type which assumes its concave-inward configuration when there is a vacuum of at least a predetermined level in the container, and assumes... | 02/19/1980 |
| 4148213 | Apparatus for discarding leaky packages from a row of filled sealed packages Apparatus for discarding leaky packages from a row of filled sealed packages on a conveyor belt comprising means for exerting pressure on the packages while on the belt and means for removing packages from the belt which appear to be leaky when subjected ... | 04/10/1979 |
