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...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 |
| 6089233 | Diving mask supplemented with a device for equalizing pressure across the eardrum of divers A diving mask supplemented with a device for facilitating the equalization of pressure across the eardrum of a user, including (a) a mask body configured to closely fit the face of the user so as to cover at least the eyes and nose of the user, so that, w... | 07/18/2000 |
| 5865183 | Device for equalizing pressure across the eardrum of divers A device for facilitating the equalization of pressure across the eardrum of a user, comprising (a) an ear piece being sized and dimensioned for tightly fitting the outer ear canal of the user, such that when the user being underwater, water being prevent... | 02/02/1999 |
