Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 4740673 | Dual control thermostat circuit An external circuit that works in conjunction with the existing tank thermostatic controls to control both a heat pump and existing resistance elements in compliance with existing governmental codes. At the same time, this circuit disables the resistive h... | 04/26/1988 |
| 4434539 | Method of manufacturing a heat exchanger A heat exchanger including a first piece of heat conductive tubing wound in helical configuration defining a plurality of first helical flights having an outboard portion thereon and a second piece of heat conductive tubing wound in a helical configuratio... | 03/06/1984 |
| 4385723 | Connection assembly A connection assembly for connecting an external heating unit to a heater water tank comprising a mounting assembly connected to a tank opening with a passage opening interiorly of the water tank and connected to the heating unit exteriorly of the water t... | 05/31/1983 |
| 4316502 | Helically flighted heat exchanger A heat exchanger including a first piece of heat conductive tubing wound in a helical configuration defining a plurality of first helical flights having an outboard portion thereon and a second piece of heat conductive tubing wound in a helical configurat... | 02/23/1982 |
