Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4487126 | Safety fuse with automatic underwater self-disarming A pressure-actuated fuse has a housing formed with an inner chamber and with a passage having an outer end opening to the exterior and an inner end opening into the chamber. A plug in the passage has a porosity sufficient to allow slow liquid flow through... | 12/11/1984 |
| 4369709 | Underwater detonating device An underwater ignition device is provided comprising a rotor, a detonator disposed at the rotor, a locking pin secured in position by a safety pin, a release pin maintained in position by the locking pin, a first water pressure safety device normally enga... | 01/25/1983 |
| 4311097 | Dual underwater safety fuse A fuse apparatus for a depth charge or the like has a primary fuse that operates at a relatively shallow depth to position a detonator in line with a firing pin, and a secondary fuse that operates to release the firing pin to explose the detonator. A safe... | 01/19/1982 |
| 4160411 | Sound signal body for generating underwater sound signals A sound signal body, for generating underwater sound signals, that includes an explosive body which can be thrown out or released by hand. Within the explosive body is arranged an explosive charge as well as a hand grenade detonator having a pyrotechnical... | 07/10/1979 |
| 4056058 | Safety fuse for underwater artefacts A safety fuse for an underwater explosive, including a piston shiftable longitudinally to detonate the explosive, a diaphragm attached to the piston such that pressure on one side of the diaphragm moves the piston to detonate the explosive and ports commu... | 11/01/1977 |
| 4016815 | Depth charge igniter A depth charge igniter has a circumferential water pressure actuated shear pin between the cover and movable plunger adopted to hit a percussion cap, which shear pin may be adjustably engaged along its circumferential length to set a predetermined detonat... | 04/12/1977 |
