| Patents for B63B 41 - Drop keels, e.g. centre boards or side boards (421) |
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| 10/23/2002 | EP0750560B1 A yacht |
| 09/26/2002 | DE10213447A1 Swing keel, for a boat, is on a swing carrier in a mounting at the mast or a floor rib to swing to the side in shallow water, with a locking mechanism to prevent an accidental swing movement |
| 09/25/2002 | EP1242276A1 Way as acronym for wave avoidance yacht |
| 09/24/2002 | US6453836 Sailboat keel with a rotatable secondary foil |
| 08/15/2002 | WO2002062657A1 Adjustable keel for sailboats |
| 08/06/2002 | US6427619 Open-trough kayak leeboard kit |
| 06/04/2002 | US6397771 Retractable wing keel for sailboats |
| 02/26/2002 | US6349659 Sailboat rotatable keel appendage |
| 02/20/2002 | EP1180082A1 Slidable and impact absorbing keel |
| 01/15/2002 | US6338308 Device for moving and controlling the keels of sailing yachts |
| 12/06/2001 | WO2001092096A1 Sailboat for sailing in shallow water |
| 12/04/2001 | US6325009 Sailboat for sailing in shallow water |
| 11/01/2001 | WO2001081165A1 Device for varying a ship's draught resulting in providing a pendular keel enhancing moment of statical stability |
| 10/11/2001 | WO2001032500B1 Way as acronym for wave avoidance yacht |
| 08/30/2001 | US20010017098 Weighted daggerboard stabilizer for wind surfing apparatus |
| 05/23/2001 | EP0862531B1 Monohull water-borne craft |
| 05/10/2001 | WO2001032500A1 Way as acronym for wave avoidance yacht |
| 12/07/2000 | WO2000073130A1 Slidable and impact absorbing keel |
| 04/27/2000 | DE19848764A1 Keel system for an outrigger boat has two keel blades on end swing mountings at the leeward side of the hull with a coupling for simultaneous manual operation |
| 03/29/2000 | EP0989056A2 Arrangement for moving and controlling the keels of sailing yachts |
| 03/07/2000 | US6032603 Method and apparatus to increase the velocity of sailing vessels |
| 03/07/2000 | US6032600 Weighted daggerboard stabilizer for wind surfing apparatus |
| 11/02/1999 | US5975974 Removable surf fin system |
| 10/19/1999 | US5967074 Keel for sail ships |
| 09/15/1999 | EP0941919A1 Retractable keel for sailboats |
| 08/19/1999 | DE19825930A1 Heeling reduction system for sailing boats |
| 08/17/1999 | US5937777 Monohull water-borne craft |
| 08/10/1999 | US5934214 Method of sailing a boat, and sailing vessel |
| 06/10/1999 | DE19857612A1 Hydrofoil boat with fin propulsion system |
| 06/01/1999 | US5908005 Yacht |
| 03/18/1999 | DE19740048A1 Flat lifting keel for sailing boat |
| 01/07/1999 | DE19727803A1 Holding device for folding centre board, particularly of surf board |
| 12/02/1998 | EP0837817B1 Method of sailing a boat, and sailing vessel |
| 10/13/1998 | US5819678 Boat keel stabilizer system for trolling |
| 09/29/1998 | US5813890 Pivoting fin with elastic bias |
| 09/22/1998 | US5809926 Lifting fin |
| 09/22/1998 | US5809923 Apparatus for controlling the buoyancy and draft of a vessel |
| 09/09/1998 | EP0862531A1 Monohull water-borne craft |
| 08/06/1998 | WO1998033701A1 Weighted daggerboard stabilizer for windsurfing apparatus |
| 07/29/1998 | EP0855339A2 Keel for sailing vessels |
| 07/28/1998 | US5784976 Windsurfer apparatus |
| 04/29/1998 | EP0837817A1 Method of sailing a boat, and sailing vessel |
| 04/08/1998 | EP0834451A2 Removable surf fin system |
| 01/07/1998 | EP0816219A2 Watercraft with a raisable keel |
| 11/20/1997 | DE19620104A1 Water craft |
| 10/23/1997 | WO1997038895A1 Improved keel for aquatic craft |
| 09/25/1997 | DE19610875A1 Inflatable emergency float for ship etc. |
| 09/09/1997 | US5664979 Pivoting fin for watercraft |
| 06/26/1997 | WO1997022513A1 Monohull water-borne craft |
| 06/19/1997 | DE19546471A1 Fin keel for boat |
| 04/22/1997 | US5622130 Heel control system for sailing yachts and sailing yacht hull |
| 02/20/1997 | WO1997006051A1 Method of sailing a boat, and sailing vessel |
| 02/20/1997 | CA2229033A1 Method for sailing a boat, and sailing vessel |
| 02/18/1997 | US5603277 Tack aback sailboat |
| 02/06/1997 | DE19528796A1 Verfahren zum Betreiben eines Segelschiffes und Segelschiff A method of operating a sailing ship and sailing ship |
| 01/02/1997 | EP0750560A1 A yacht |
| 10/02/1996 | DE19510680A1 Wind drive device for single-hull ships |
| 05/09/1996 | DE19515114A1 Fin propulsion for muscle-powered water craft |
| 04/02/1996 | US5503097 For a watercraft |
| 02/27/1996 | US5493989 Adjustable fin box system |
| 09/28/1995 | WO1995025663A1 A yacht |
| 09/28/1995 | CA2185432A1 A yacht |
| 09/19/1995 | CA2119417A1 Sailing vessel |
| 07/11/1995 | US5431121 Sailboat keel hoist assembly |
| 06/01/1995 | DE4340028A1 Windward-travel system for sailing vessel |
| 05/23/1995 | CA2109685A1 Vaiable keel for sailing vessels (with the possibility to increase or decrease alternatively) |
| 05/02/1995 | US5410977 Rudderless sailboat |
| 03/02/1995 | DE4328936A1 Sailing boat with a retractable pivoting centreboard |
| 10/06/1994 | DE4310471A1 Centreboard, which can be filled with water, as trimming ballast for sailing yachts |
| 10/04/1994 | US5351638 Keel assembly for a sailboat |
| 05/24/1994 | US5313905 Twin wing sailing yacht |
| 03/03/1994 | DE4229101A1 Keel construction for sailing boat - has guide device on underside, extending across length of boat in arc formation, keel has drive for moving inside guide device |
| 12/28/1993 | US5273471 Fin for a windsurf board |
| 10/14/1993 | WO1993019978A1 Foil device |
| 06/17/1993 | DE4140817A1 Folding keel for sailing boat - is split into two halves about central plane to sit on mud berth |
| 05/26/1993 | EP0542953A1 Improvements in or relating to multi-hull vessels with fixed sails |
| 02/18/1993 | DE4226545A1 Keel withdrawal and angle adjuster for sailing vessel - uses cranks to lower, rotate and adjust angle of keel from within boat. |
| 01/05/1993 | US5176096 Assembly for fastening a fin to a sailboard |
| 11/17/1992 | US5163377 Sailing yacht |
| 10/29/1992 | WO1992018376A1 Improvements in or relating to multi-hull vessels with fixed sails |
| 10/06/1992 | US5152238 Split-hinged, winged, self-cradling shallow draft keel for sailing vessel |
| 10/06/1992 | CA1308307C Foil arrangement for water-borne craft |
| 08/20/1992 | WO1992013758A1 Flexible tailored elastic airfoil section |
| 03/25/1992 | EP0476435A1 Watertight synthetic gland for the keel box and the keel, especially for surfboards |
| 03/25/1992 | EP0232359B1 Sailing boat |
| 12/11/1991 | EP0460438A2 Fastening arrangement for a fin on a sailboard |
| 10/29/1991 | CA1291373C Steerable keel |
| 08/06/1991 | US5036783 Sailing yacht with a centerboard |
| 07/24/1991 | EP0374138A4 Flanged fin for watercraft |
| 07/09/1991 | US5030151 Flanged fin for watercraft |
| 06/06/1991 | DE3939437A1 Yacht with device to counteract heeling over - which is formed by hinged flaps fitted in openings in keel |
| 06/06/1991 | DE3939435A1 Damping pitching motion of yacht - involves elastically flexible float attached to stern end of keel |
| 05/29/1991 | DE3939014A1 Hinged fins attached to keel of sailing ship - can be held at angle to generate hydrodynamic forces to assist in ship propulsion |
| 04/23/1991 | US5009178 Self activating keel |
| 03/26/1991 | US5002001 Blade-like profiled device for acting on a gaseous or liquid fluid flow |
| 02/20/1991 | EP0412965A1 Keel for boats |
| 02/07/1991 | WO1991001249A1 Support structure for a lateral appendage to a small craft |
| 01/30/1991 | EP0232252B1 A steerable keel |
| 11/15/1990 | WO1990013477A1 Sail-wing and controls for a sail craft |
| 09/26/1990 | EP0388403A1 Fin, keel, or leeboard for sailing vessels, boats and surf boards equipped with a sail |