Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 6935040 | Cable installation system and related methods A cable installation system for use by a cable installer may include a plurality of cable dispensers having different lengths of cable. In particular, each cable dispenser may also have a non-numeric, length-identifying marking associated therewith corresponding to ... | 08/30/2005 |
| 6694632 | Level A level comprises a frame defining first and second parallel channels and first and second rails fitted slidingly in the first and second channels respectively. The level is adjustable in length by sliding the rails in the respective channels of the frame... | 02/24/2004 |
| 5653036 | Drop finder The invention is a device used to mark a point in connection with the installation of an indoor sprinkler system in a ceiling or wall such that the device is connected to installed sprinkler system piping and the telescopic pointer is extended to the nece... | 08/05/1997 |
| 4825555 | Apparatus for automatic forming on a film material of both a mask film pattern and a positioning hole An automatic mask cutting/drawing apparatus for preparing a mask film and for forming both positioning holes and a desired image mask pattern or a drawing of a desired line image includes a table for supporting a film material thereon, a first carriage mo... | 05/02/1989 |
| 4285135 | Panel cutting guide The panel cutting guide includes a primary elongated measuring rod and a pair of secondary measuring arms releasably secured thereto in spaced parallel relationship. A pair of marker elements are slidably mounted on each of the secondary measuring arms, o... | 08/25/1981 |
| 4230011 | Automatic center punch for templates A machine for production shops to make templates, the machine including a flat base having stops against which a template blank can be rested two tracks going north to south, or vice-versa, along which a first gauge carriage travels ONLY north to south, o... | 10/28/1980 |
| 4202108 | Apparatus and method for marking points and lines during building construction An apparatus and method for marking points and lines during building construction, includes a layout tool having a plurality of elongate members adjustably secured together for axial extension relative to one another to different lengths, the members defi... | 05/13/1980 |
| 4153383 | Work preparation and ruling machine A work preparation and ruling machine is provided for the production of semi-cylindrical rotary dies. The machine comprises a longitudinal cylinder mounted for rotation in frame and being provided with a series of equally spaced longitudinal rows of holes... | 05/08/1979 |
| 4069586 | Center punch A center punch particularly adapted for locating and marking the center position of a circular opening, as for making a center mark in a stud that has been broken off below the surface, to facilitate drilling and removing the stud. Movable jaws are each p... | 01/24/1978 |
