Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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US Patent 4822277 - Orthodontic trivider
US Patent Issued on April 18, 1989
Estimated Patent Expiration Date:
December 15, 2007Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
December 15, 2007Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractAn orthodontic apparatus is disclosed comprising a divider like device with three arms. The outer arms operate in normal fashion while the central arm is coupled to the adjusting wheel so that its relative position with respect to the outer arm is constant. The central arm has a bracket retaining reverse tweezer arrangement for holding and positioning orthodontic brackets on teeth. In use the outer arms are located on either side of the tooth and the central arm locates the bracket in the correct position for fixing to the tooth. | InventorApplicationNo. 07/132966 filed on 12/15/1987US Classes:433/3ToolField of Search433/6, By mouthpiece-type retainer433/3, Tool433/159Having handles to pivot surface (e.g., pliers)ExaminersPrimary: Peshock, RobertAttorney, Agent or FirmUS Patent References3686762, 4035919, Direct bonding bracket positioning and mounting toolIssued on: 07/19/1977 Inventor: Cusato4725228Tooth crown center locating device Issued on: 02/16/1988 Inventor: Andrews International ClassesA61C 7/14 (20060101)A61C 7/00 (20060101) Foreign Application Priority Data1986-12-22 AU |
