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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7096533 | Locking roller for an article of furniture A locking roller assembly includes a housing adapted for mounting to an article of furniture. A wheel is rotatably mounted to the housing via a mounting arrangement that accommodates relative vertical movement between the wheel and the housing. The wheel is mounted ... | 08/29/2006 |
| 6446982 | In-line skate conversion apparatus At least one walking member is detachably connectable to an in-line skate to enable the wearer of the in-line skate to connect the walking member to the in-line skate, thus enabling the wearer to walk while wearing the in-line skate. Two walking members c... | 09/10/2002 |
| 6435524 | In-line-roller-skate interchangeable independent suspension, removable boot and a chassis supporting multiple brake systems An in-line roller skate in accordance with this present invention includes at least four integral independent suspension system aligned under the chassis platform having all forks axles pivotally in forward motion and opposite direction from each other. T... | 08/20/2002 |
| 6003881 | Variable training resistance device A variable training resistance device for an in-line skate. The skate includes a boot and a plurality of wheels disposed on a chassis. A resistance assembly, including a cam and bearing assembly or a rack and pinion assembly, is disposed between two of th... | 12/21/1999 |
| 5685550 | Roller skate with brake A shaft extending in the skating directions is supported by stanchions depending from a boot plate. Spherical wheels formed by hemispherical segments are rotatably secured to the shaft in fixed axial position by a ring member having wing axles extending t... | 11/11/1997 |
| 5551712 | Skate brake and braking system A skate brake and braking system for in-line skates, roller skates and like devices is disclosed. The skate brake comprises of a chassis which is comprised of a set of aligned runners with slots located therein to accept an axle mounted wheel, springs to ... | 09/03/1996 |
| 5312165 | Combination brake and wheel system for in-line roller skates and the like A brake and wheel for in-line roller skates having multiple slip disks (30a to 30ad) which are placed on retainer ring (40). Slip disks (30a to 30ad) being made of flexible plastic material, and retainer ring (40) being made of low friction plastic materi... | 05/17/1994 |
| 4898403 | Roller ski A roller ski that uses a wheel including a stationary member, a rotating tire member, and a liquid between the two to provide viscous damping to rotation of the tire member. The roller ski tire member can increase in width from a hub portion to a crown po... | 02/06/1990 |
