Sail system for sailboards
Patent 4365570 Issued on December 28, 1982. Estimated Expiration Date: 
September 21, 2001. Estimated 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.
September 21, 2001. Estimated 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.Patent References 2367164 2577917 3455261 3487800 3874816 Windsurfer Surfboard Elastic connection assembly for the mast of a sailboat Sail boards Sailing booms InventorApplicationNo. 06/304113 filed on 09/21/1981US Classes:114/39.11, METHOD OF SAILING SAILPOWERED WATERCRAFT114/102.12, Having means to tension or stretch sail114/108, Fastening device for sail114/113, Hoops and connections114/39.12, SAILBOARD AND RIG MEANS THEREFOR114/98PivotedExaminersPrimary: Frankfort, Charles E.Assistant: Brahan, Thomas J. Attorney, Agent or FirmInternational ClassB63B 35/73 (20060101)AbstractIn accordance with one aspect of the disclosure, the sail portion of a sailboard has upper and lower sections, and the lower edge (foot) of the upper section is lapped relative to the upper edge (head) of the lower section. Apparatus is provided to cause the lower edge to be on the upwind side of the upper edge, regardless of the tack that the boat is on. Such apparatus comprises a rotating boom which rotates through the sail, in such manner as to shift from one side of the sail to the other and also cause the above-described lapped relationship to occur in either tack. The diclosure further relates to a combination of the sail system with the board, to the method of achieving the indicated lapped relationship and of rotating the boom, and to other important features.Other References
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