Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 7357728 | Human free-fall slide A slide and process of using the slide for humans' amusement, recreation and entertainment. The slide is an inflatable apparatus comprising a slide device and an airbag device. The slide device is an inflatable bag having a slide segment. The airbag device has a bot... | 04/15/2008 |
| 7134526 | Driveway safety net and method A driveway safety net. The safety net includes two stakes and a net that attaches between the two stakes. When the two stakes are placed on both sides of a driveway and the net is attached between the two stakes, the net hinders balls and other toys from rolling pas... | 11/14/2006 |
| 7094181 | Transportable trampoline system A portable trampoline exercise system, including a foldable trampoline with long-lasting rigidity in the frame and a specifically adapted carrying case for transporting the folded trampoline. The trampoline is made foldable by using hinges to connect sections of the... | 08/22/2006 |
| 7060001 | Trampoline system A trampoline system has a rebounding bed and a resilient member located below the bed at such a position that the bed depresses the resilient member when the bed is sufficiently depressed by a person jumping on the bed. The presence of the resilient member makes it ... | 06/13/2006 |
| 7018322 | Quarter-foldable rebounder with improved features A quarter-foldable rebounder includes a frame of circular configuration, a circular mat, springs and legs. The frame is formed by four one-piece molded quarter-frame arcuate segments having integral pairs of half-fold and quarter-fold hinges and a rod embedded in ea... | 03/28/2006 |
| 6846271 | Trampoline system with plural beds A trampoline system has a rebounding bed and a resilient member located below the bed at such a position that the bed depresses the resilient member when the bed is sufficiently depressed by a person jumping on the bed. The presence of the resilient member makes it ... | 01/25/2005 |
| 5984837 | Tensioned floor system A play system floor includes a frame defining the periphery of an area to be floored and a webbed flooring constructed of a webbing material extending between the frame members. The webbing material has an optimal predetermined stretch coefficient at whic... | 11/16/1999 |
| 5336135 | Amusement apparatus In one embodiment the amusement device is a series of trampolines arranged vertically and offset to allow a user, starting at the top to spring serially from the uppermost to lower trampolines. A tram can deliver the user to the top. In another embodiment... | 08/09/1994 |
| 5299989 | All surface trampoline An all surface trampoline comprising a hollow inflatible support having an inner and an outer periphery and having an open space between the inner periphery, an elastic trampoline mat suspended over the open space, and wherein a suspension device includes... | 04/05/1994 |
| 4351413 | Deceleration apparatus for safety nets A landing net assembly (10) provides a controlled deceleration landing device for pole vaulters, high jumpers and the like in such a way that the impact of a free-falling body and the rate of displacement of the landing net is dampened in a controlled man... | 09/28/1982 |
| 4284271 | Hexagonal jogging platform A hexagonal jogging platform having a tubular support frame with rounded corners, detachable, tubular support legs at each corner and a fabric platform attached to the tubular frame by novel coil springs having hooked ends bent from the axial center of th... | 08/18/1981 |
| 4162063 | Adjustable springs for trampolines and the like The typical helical springs used to support the bed within the frame of a trampoline or the like are modified to incorporate adjustable hooks threadedly anchored within the springs at one end so that their overall length, and thus the tension on the bed, ... | 07/24/1979 |
| 4159826 | Pneumatic jogging platform My pneumatically sustained, flexible exercise surface-and-platform, which I call a "Trampol-air," initially designed for foot-ease along with all the benefits of exercising in any jogging-like manner on a flexing-resilient mini-trampoline-like surface, co... | 07/03/1979 |
| 4068739 | Disaster evacuation air cushion A disaster evacuation apparatus is disclosed which is particularly useful in the evacuation of victims caught in fires of multistoried buildings, airplane crashes, or similar disasters where the normal escape routes or fire exits have been made inaccessib... | 01/17/1978 |
| 4054103 | Techniques for safely unloading externally-slung helicopter loads Precision hover is necessary when one must position a load precisely on the deck of a ship. Manual precision hover is possible under very light wind gust conditions and a calm sea. The techniques described here are directed to those special windy days whe... | 10/18/1977 |
| 3983585 | Concealed spring anchoring means for trampolines and method of producing same Cushioning pads are placed along the sides of a trampoline and have sufficient width to cover the ordinarily exposed springs. The sides of the trampoline frame are reinforced by an extra tube which assists in supporting the pads out of frictional contact ... | 10/05/1976 |
| 3948351 | Catching device for a free-falling body A catching device for a free-falling body comprising a material web which is held at opposite sides at support bars or ledges which are supported at a spacing from the floor. The support bars are held resiliently damped at a portable base frame carrying t... | 04/06/1976 |