...that on Dec. 15, 1836, the Patent Office was completely destroyed by fire? Lost were some 7,000 models, 9,000 drawings, and 230 books plus all records of patent applications and grants.
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| Number | Title | Issue Date |
| 7160166 | Underwater flotation safety device An underwater flotation safety device includes a base that may be positioned below the water surface of a swimming pool with ballast, a hook, or the like. A buoyant member is releasably coupled to the base and is also positioned below the water surface. A release me... | 01/09/2007 |
| 5775226 | Underwater and land travel vehicle A pair of travel rails (46) each having an upper surface and a lower surface are laid to extend from on the land (44) into the water (45). Main tires (12) are rotatably disposed on opposite sides of a vehicle body (1), so that they are located between the... | 07/07/1998 |
| 4805549 | Device for subsea operations A device for carrying out works under water includes a twin hull submarine (1,2) which can be combined with a number of specially adapted cargo modules (12), in which the twin hull submarine between its two hulls (1,2) is provided with a cargo holder (15)... | 02/21/1989 |