Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 7281963 | Energy-conserving swim fin An energy-conserving swim fin, in which a blade extends from a front portion of a foot pocket of a swim fin, and at least one spring is fitted at an appropriate position on the blade. The springs are structured such that support is provided when force is inwardly ap... | 10/16/2007 |
| 7159336 | Amphibious shoe An improved amphibious shoe (10) with a swim fin structure which extends for swimming and folds for walking. The amphibious shoe has, in one embodiment, an elastic connection member (27A, 27B) movably connecting the shoe portion (40) of t... | 01/09/2007 |
| 7048601 | Swimming flipper with blade and footwear structure A swimming flipper comprising a blade and a footwear structure disengagingly coupled with the blade, the footwear structure including a sole and a pair of flaps attached to the sole. The flaps are attachable to and detachable from each other and are comprised of a c... | 05/23/2006 |
| 6227923 | Foot propulsion device for float tube users A fin assembly for attachment to the foot covering of a float tube user is disclosed, the foot covering having a sole, a toe portion and a heel portion. The assembly includes a base member having a front portion, a rear portion, an upper surface and a low... | 05/08/2001 |
| 6193636 | Swimming auxiliary device A swimming auxiliary device includes an attaching member an attaching member mounted to the swimmer's calf or forearm, and a connecting device connected to the attaching member so as to pivotally connect a web member to the attaching member. A pulling dev... | 02/27/2001 |
| 6120336 | Diving fin A diving fin comprises a boot section and a fin section as separate parts which are held in an assembly by a supportive or hinge structure incorporated in the forefront of the boot section and a rear edge of the fin section. The hinge structure comprises ... | 09/19/2000 |
| 5593333 | Fin assembly for float tube users A fin assembly is disclosed for attachment to a boot of a float tube user, the boot having a sole, a toe and a heel. The assembly includes a base member having a mechanism for attachment to a boot. The base member has a front portion for attachment proxim... | 01/14/1997 |
| 5292272 | Dual mode swim fin A swim fin for use in a swimming mode and in a walking mode has a boot portion including a shoe having a foot receiving pocket and a bulbous connecting member. Three tracks are formed in the connecting member terminating in a cavity at each end of each tr... | 03/08/1994 |
| 5151060 | Swimming flipper A swimming flipper having separated shoe (1) and fin (2). The flipper consists mainly of a shoe (1) and a fin (2), a hinge (7) which connects the bottom portion of the shoe (1) with the front portion of the fin (2) and allows the shoe (1) to rotate with r... | 09/29/1992 |
| 5108327 | Retractable swim fin Improved swimming efficiency and safety in a water environment is achieved with the use of retractable swim fins having a web-like member rotatably interconnected to a shoe-like member. A latch includes a latch element which secures the web-like member to... | 04/28/1992 |
| 5087217 | Swimming shoe A swimming shoe composed of a shoe body, several water-resisting flanges and an attached swimming-assistance device. The shoe body has the shape of a sandal which has a shoe bottom, a shoe surface, two fixing plates and a fastener. In the vamp of the shoe... | 02/11/1992 |
| 4981454 | Retractable swim fin Improved swimming efficiency and safety in a water environment is achieved with the use of retractable swim fins having a web-like member rotatably interconnected to a shoe-like member. Latching means secure the web-like member to the shoe-like member in ... | 01/01/1991 |
| 4944703 | Swim fin having multiple articulating transverse hydrofoil blades A swim fin includes a foot receptacle for attaching to a swimmer or diver's foot. A pair of parallel beam supports are secured to the foot and toe portion of the foot receptacle and support a plurality of hydrofoil blades therebetween in a pivotal attachm... | 07/31/1990 |
| 4940437 | Swim fin with harness A swim fin includes harness for attachment to a wearer's foot, the harness including an adjustable strap secured to the fin on opposite sides of a forward portion of the wearer's foot, the adjustable strap forming an X configuration passing over the weare... | 07/10/1990 |
| 4599071 | Adjustable beach-shoes The improvement provided by this invention is directed at the conventional beach-shoe and diving flipper, and according to this invention, a novel beach-shoe capable of acting as a diving flipper is provided. The web portion is extensible relative to a sh... | 07/08/1986 |
| 4178128 | Method of and device for propulsion A propulsion device and its method of use, the device having a forward foil and a rearward foil adapted for alternate transverse reciprocal and alternate pivotal movement in opposed direction about parallel axes. The forward and rearward foil axes are per... | 12/11/1979 |
