Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 6345412 | Arrangement for controlling an angularly movable member A control mechanism for use with a door closer having a pinion shaft. The control mechanism comprises a coiled torsion spring around the shaft with a free end of the spring lying along part of a strap. The strap is connected to the shaft and normally held... | 02/12/2002 |
| 6321505 | Metal door and method of production A door comprising two metal panels and an internal core structure. The panels have their edges formed around a perimeter sub-frame of channel construction, the base of the channel being internally adjacent the respective edge of the door. Opposing edges o... | 11/27/2001 |
| 6282750 | Power adjustment size indicator for a door closer A gear driven dial indicator is used to indicate the door closer size for a door closer having an adjustable closing force. A drive gear is attached to the door closer adjustment screw. In the preferred embodiment, this drive gear engages a ring gear whic... | 09/04/2001 |
| 6112368 | Temperature compensating valve A valve element for operative association with a valve seat in a passage in a body in which the valve element is mounted, in use, the valve element comprising first and second portions connected together by snap-fit means, the first portion being screw-th... | 09/05/2000 |
