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Actor Marlon Brando has four patents, all named "Drumhead tensioning device and method."
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| Number | Title | Issue Date |
| 8002598 | Adjustable rowlock An adjustable rowlock for changing the orientation of the blade of an oar has a body with a clamp and clamp adjusting means. There is also an oar sleeve having a datum mark to be aligned with a plurality of reference marks arranged on the body. In use, a user may ch... | 08/23/2011 |
| 6632111 | Paddle support for a vessel A paddle support assists in rowing a vessel. The paddle is retained in the upper portion of a support that has a base section that rests, preferably unattached or at least readily releasably attached on the floor of a vessel. The support allows the paddle... | 10/14/2003 |
| 5324218 | Apparatus for adjusting the leverage of an oar or scull while rowing An oar or scull is equipped with a movable sliding bushing or collar (2, 3) for adjusting the leverage while rowing. For this purpose a locking device (12) normally prevents the linear or axial movement of the oar shaft with a sliding sleeve (8) which is ... | 06/28/1994 |
| 5213529 | Oar horn An improved oar horn assembly includes a socket constructed to be fixed to the side of a boat for rotatably mounting an oar horn. The oar horn includes a ring having a substantially ovular through-hole for receiving the oar. The ovular through-hole is con... | 05/25/1993 |
| 4664637 | Oar The oar disclosed herein is re-enforce by a stay which is anchored at both ends of the oar shaft and is supported near the oar lock location by a brace. The two points, where the stay emanates from the oar shaft, lie in the same plane as a set of points a... | 05/12/1987 |
| 4662849 | Oar lock Two sleeves are arranged tangentially and are structurally connected to form the main body of the oar lock. One of the two sleeves, being larger than the other, is dimensioned to allow an oar shaft to pass through the sleeve. This larger sleeve is situate... | 05/05/1987 |
