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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4487411 | Playground tube slide A tube slide includes a combination of common curved and straight tube bed sections connected through a radially extending flange where the lowermost tube section is curved and may be rotated in either direction to accommodate space limitations. A contour... | 12/11/1984 |
| 4484738 | Playground deck A playground deck of all metal construction includes common components, a platform around which walls are formed from a combination of corner panels having right angle wing sections and single panels substantially the size of a wing section and center pan... | 11/27/1984 |
| 4447055 | Playground equipment with wooden timbers having internal fasteners Playground equipment having wooden timbers includes a plastic fastener with a metal threaded core flushly mounted in the wooden timbers for interconnecting the wooden timbers to associated members of the playground unit. The plastic fastener has one-way t... | 05/08/1984 |
| 4393812 | Swine farrowing hut and method of farrowing pigs and maintaining a disease - free farrowing hut A farrowing hut structure of non-porous fiberglass material is pivotally connected at one of its ends to one end of a fiberglass floor for being pivoted between lowered and raised positions with the floor and interior of the hut structure being fully expo... | 07/19/1983 |
| 4379551 | Playground tube slide A tube slide includes a straight metal tube section connected through a radially extending flange to a 90° curved section formed from identical half sections connected together by mating laterally extending flanges being fastened. The curved section is o... | 04/12/1983 |
| 4369965 | Playground climber and slide An A-shaped playground climber is formed from a pair of spaced apart end pieces which include outer peripheral rims having eight flat surfaces. Extension legs extend from the vertical surfaces to the ground and steps bridge adjacent legs and diagonal surf... | 01/25/1983 |
| 4348188 | Playground design kit and method of using the same A method of designing an outdoor playground complex is disclosed. Complex components are represented by reduced scale, two-dimensional projections of interchangeable playground devices. The projections are formed into pliable, transparent templates consis... | 09/07/1982 |
| 4341377 | Seesaw A seesaw comprising or two pairs of oppositely extending arms having seats at their outer ends are connected to the sides of a frame enclosure which embraces a support post having sides and is connected thereto for resilient up and down pivotal movement t... | 07/27/1982 |
| 4296923 | Playground swing A swing unit suspended on a flexible line includes a circular seat portion to which an elongated upstanding centrally disposed stem is attached with the upper end of the stem being connected to the lower end of the flexible line. The swing unit is substan... | 10/27/1981 |
| 4286781 | Playground merry-go-round A molded plastic body includes four sections having inter frame members bolted together adjacent the periphery. A channel cap extends from a center hub over abutting body section edges and through a downwardly extending fin and is connected to the inter f... | 09/01/1981 |
