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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 |
| 7275336 | Distance measuring instrument for pedicle screws The invention relates to a distance measuring instrument for pedicle screws which detects the spacing between two pedicle screws (3, 3′) with the ends (26, 27) of two crossing limbs (11, 12) and displays it on a cross-bar (25) fixedly c... | 10/02/2007 |
| 5154003 | Pivoted-arm caliper A caliper has a pair of arms which are connected for rotation about a pivot point. Each arm has a tip and a contact surface is connected to one of the arms. The caliper includes a mechanical or electronic indicator which is responsive to the relative posi... | 10/13/1992 |
| 4972602 | Tongs for handling and measuring crabs A pair of pivotally connected crossed arms define tongs having handles at one end and recessed jaw parts at the other. The recesses in the jaw parts are of a size to receive therein the pointed end tips of a crab shell whereby a crab may be easily lifted ... | 11/27/1990 |
| 4315372 | Caliper for applying constant pressure to an object being measured A constant pressure caliper commonly used to measure the thickness of skin folds and wherein the caliper arms are separated by the actuation of a slide mechanism and are urged together by a constant force spring acting through a linkage that applies a con... | 02/16/1982 |
