Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4698877 | Cabinet hinge In a hinge for hanging flush overlap doors, the door-related hinge part which can be mounted on the door is coupled by an articulation mechanism to a carcase-related hinge part in the form of an elongated supporting arm which in turn is secured to a mount... | 10/13/1987 |
| 4653144 | Adjustable arcuated cabinet hinge A hinge for the hanging of a door, especially an inset or recessed glass door, on the carcase of a piece of furniture has a door-related hinge part which is coupled by a linkage mechanism to a wall-related hinge part which can be fastened to a wall of the... | 03/31/1987 |
| 4422214 | Over-center hinge Over-center hinge for a cabinet door, having a supporting-wall-related part which can be fastened to the supporting wall of a cabinet, and a door-related part joined pivotingly to the supporting-wall-related part by a linkage mechanism and constructed as ... | 12/27/1983 |
| 4329759 | Over-center hinge, especially for mirrored cabinet doors Over-center hinge for thin-walled doors of cabinets, especially of bathroom mirrored cabinets, having a shallow, door-related hinge part which is articulately joined to a supporting arm fastenable to the supporting walls of the cabinet, and which can be f... | 05/18/1982 |
| 4297763 | Furniture hinge A hinge for the pivotable linking of a door leaf or lid to the carcass of a furniture piece having a door-related part attachable to the door leaf or lid and a supporting-wall-related part, which parts are pivotingly joined together in the manner of a fou... | 11/03/1981 |
| 4154343 | See-through packaging for furniture hinges See-through packaging for the self-service sale of furniture hinges in small quantities, consisting of a plastic box of appropriate size serving for the accomodation of the hinges, having a rectangular or square bottom and sidewalls projecting upwardly at... | 05/15/1979 |
| 4117569 | Over-center knuckle-joint hinge A knuckle-joint over-center hinge, in combination with a first member for connection to a wall and a second member for connection to a door, and a first arm and a second arm, respectively, pivotaly linked to the first and second member, and an over-center... | 10/03/1978 |