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 |
| 7156190 | Impact tool An impact tool has a slidable hammer that is driven by hydraulic oil under pressure inside a chamber. The hydraulic oil is pressurized by a piston driven by compressed gas on the opposite side of the piston from the hydraulic oil. The gas in the gas chamber is compr... | 01/02/2007 |
| 5159814 | Pneumatic impulse motor with gas cushion An impulse motor for a hand held hammer machine comprises a housing (10) with a cylinder (11) therein, in which a reciprocating drive piston (40) via a gas cushion in a working chamber (44) of said cylinder (11) repeatedly drives a hammer piston (15) to i... | 11/03/1992 |
| 4932479 | Vacuum-compression type percussion power tool with a pumping chamber A vacuum-compression type percussion power tool comprises a housing (12), a cylinder (14) fixed in the housing, a piston (16) reciprocating in the cylinder (14) from a reciprocating drive mechanism such as a crank mechanism (18) driven by an electric moto... | 06/12/1990 |
| 4828046 | Vacuum-compression type percussion power tool with an auxiliary chamber A vacuum-compression type percussion power tool comprising a housing (12), a cylinder (14) fixed in the housing, a piston (16) reciprocating in the cylinder (14) from a reciprocating drive mechanism such as a crank mechanism (18) driven by an electric mot... | 05/09/1989 |
| 4823886 | Vacuum-compression type percussion power tool A vacuum-compression type percussion power tool comprising a housing (12), a cylinder (14) fixed in the housing, a piston (16) reciprocating in the cylinder (14) from a reciprocating drive mechanism such as a crank mechanism (18) driven by an electric mot... | 04/25/1989 |
| 4346768 | Impact device with sinusoidal rotary-to-reciprocative converter The rotary output of the power source of an impact device is converted to reciprocation of a body, preferably having a resilient coupler, which drives a ram into impacting in an improved rotary-to-reciprocative motion converter including a crankshaft oper... | 08/31/1982 |
| 4149384 | Fluid pressure amplifier A fluid pressure amplifier for intensifying fluid pressure, the amplifier comprising a housing including a hydraulic fluid reservoir therein. A first chamber includes a slave piston mounted for reciprocation therein and for abutting engagement with a work... | 04/17/1979 |
| 4049078 | Marine acoustic pulse train signal generator An apparatus for generating a series of seismic acoustic pulses in a body of water. The series is characterized by having continuously-variable, non-repetitive time intervals between successive pulses during a continuous seismic recording. The preferred g... | 09/20/1977 |
| 4047849 | Pneumatic pulsator pumping system with pulsator fluid venting valve A pneumatic pump adapted primarily as a left ventricular heart assist device includes a flexible bladder with a rigid housing. A pneumatic driver applies rhymical pulses between the bladder and the housing to repetitively collapse the bladder and establis... | 09/13/1977 |
| 3948051 | Fluid pressure amplifier A fluid pressure amplifier for intensifying fluid pressure, the amplifier comprising a housing including a gas-hydraulic interface piston; a first chamber includes a slave piston mounted for reciprocation therein and for abutting engagement with a work pi... | 04/06/1976 |
