Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 5518446 | Fume hood exhaust terminal A fume hood exhaust terminal for monitoring and controlling gas flow in a duct system includes a tubular duct segment having an upstream end, a downstream end, and an inner periphery, as well as an annular ring secured to the inner periphery between the u... | 05/21/1996 |
| 5470275 | Method and apparatus for controlling fume hood face velocity using variable by-pass resistance A fume hood controller and method which compensates for resistance to air flow through a by-pass opening that exists due to a grille or louvre overlying the by-pass opening.... | 11/28/1995 |
| 5439414 | Networked fume hood monitoring system A system for monitoring the operation of laboratory fume hoods is disclosed. The system includes a local area network for reporting alarm conditions and other data to a building supervisory control system. The system has a calibrating capability which is ... | 08/08/1995 |
| 5347754 | Position sensing apparatus Apparatus for use in determining the position of an object such as a sash door of a laboratory fume hood which has an elongated base member for attachment to the fume hood adjacent the sash doors. It includes an electrical switching means having an elonga... | 09/20/1994 |
| 5092227 | Apparatus for controlling the ventilation of laboratory fume hoods Apparatus for controlling the air flow through a fume hood to maintain a predetermined average face velocity through an uncovered portion of an opening of a fume hood of the type which has at least one movable sash door adapted to cover the opening as the... | 03/03/1992 |
| 5090304 | Apparatus for determining the position of a moveable structure along a track A sensing means for determining the absolute position of one or more structures such as doors, windows or the like that are moveable in sets of tracks. Apparatus comprises an electrical switching means having an elongated electrical resistance means with ... | 02/25/1992 |
