The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 31, 1991
Filed:
Feb. 09, 1990
Van O Nicolai, Vienna, VA (US);
Other;
Abstract
French horns with four finger valves and one change horn valve, instead of the standard three finger valves and one change horn valve enable play in twelve keys, as well as twelve tones. Point and dimple connections between key levers and rotary valve string bars provide smooth translation of the string bars and smooth rotation of the rotary valve hubs. Screw-on mouthpieces and mouthpipes have smooth identical inner diameters to avoid the airstream disrupting steps of conventional push-in mouthpieces. Cork block mountings between the tubes, valves and slides instead of the standard soldered metal mountings avoid transmission of vibrations between the tubes. Hand straps steady the French horns instead of the usual finger hooks.