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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 7281644 | Valve mechanism A valve mechanism for a pressure chamber, particularly a pumping device, includes a tappet and a valve disk, in which the valve disk is attached to the tappet. The valve disk is provided on the tappet so as to be movable in relative manner between a starting and an ... | 10/16/2007 |
| 7255248 | Plug style pump The embodiment of the invention are directed to a dispenser assembly having a reservoir bottle with an opening for fluid communication. The opening is formed to receive a housing cap and a dispensing pump such that the dispensing pump is sealingly engaged to the bot... | 08/14/2007 |
| 6962273 | Cylinder and valve structures for liquid-dispensing containers A liquid-dispensing structure includes: an outer cylinder with a one-way valve at its lower end to allow a liquid to flow into the outer cylinder; a hollow piston being slidable inside the outer cylinder and having a pair of liquid-tight portions formed with circula... | 11/08/2005 |
| 6347668 | Relievable check valve assembly for oil wells and water wells A relievable check valve assembly having various trigger forms for oil wells and water wells adapted to control the liquid flow when inserted tubing is being removed from a well.... | 02/19/2002 |
| 6099274 | Pump to surface pump A reciprocating pump is provided for pumping subterranean fluids containing fine solids to surface. The pump comprises a pump barrel, piston and piston rod. The piston rod is suspended form reciprocating production tubing. The barrel is anchored in the ca... | 08/08/2000 |
| 5941311 | Down-hole, production pump and circulation system A production pump & circulation tool (1, FIG. 1) used down-hole on the end of a production string (FIG. 10) including: a combined traveling valve assembly bottom connector (10) and fishing tool section (20) which engages gripping pins (51) for twisting th... | 08/24/1999 |
| 5655604 | Down-hole, production pump and circulation system A production pump & circulation tool (1, FIG. 1) used down-hole on the end of a production string (FIG. 10) including: a combined traveling valve assembly bottom connector (10) and fishing tool section (20, FIGS. 2A-2C) which engages griping pins (51) for... | 08/12/1997 |
| 5642990 | Traveling valve ball displacing tool A downhole pump is reciprocated subsurface for the purpose of lifting fluid from an underground borehole to the surface or other suitable storage location. As the fluid being pumped may contain gas, the efficiency of the pump may decrease to the point whe... | 07/01/1997 |
| 5382142 | Wall pump having backwash valve actuator A backwash valve for use in a sucker-rod actuated fluid pump, may be selectively actuated to permit both the standing and traveling ball valves to be unseated at the same time permit the pump to be backwashed and/or the production tubing string drained.... | 01/17/1995 |
| 5249936 | Downhold reciprocating pump with automatically trippable travelling valve for prevention of gas lock The travelling check valve of the pump is adapted to be automatically opened at the bottom of the down stroke, so that gasses trapped between the travelling and standing check valves may escape and eliminate gas locking. The valve member of the travelling... | 10/05/1993 |
| 5141411 | Center-anchored, rod actuated pump A fluid pump which is particularly useful in relatively deep and/or low pressure stripper wells. Stripper wells tend to produce sporadically and/or occasionally produce gas, and are often very sandy, have a tendency to become gas locked, and are susceptib... | 08/25/1992 |
| 4907953 | Locking gas equalizer assembly A locking gas equalizer is provided for use with a subsurface pump for lifting fluids having a high gas content. A mechanical lifting piston and rod are slidably mounted beneath the check valve in the traveling pump assembly. When the pump reaches the bot... | 03/13/1990 |
| 4876558 | Pump device and an ink jet recording apparatus having the pump device In a pump device wherein a piston is reciprocally moved in a predetermined range within a cylinder to thereby produce pressure, a liquid inflow hole is provided outside the predetermined range of the cylinder and a hermetically sealing member biased so as... | 10/24/1989 |
| 4867242 | Method and apparatus for breaking gas lock in oil well pumps A gas lock breaker for oil well pumps includes a stationary barrel with a standing valve on the bottom, a reciprocating piston in the barrel with a traveling valve on the bottom of the piston, an unseating rod positioned above the standing valve and adapt... | 09/19/1989 |
| 4781547 | Gas equalizer for downhole pump A gas equalizer device for use in conjunction with a reciprocatory pump located downhole in a wellbore. The device of the present invention avoids a condition commonly known in the pumpjack art as "fluid pounding", which is brought about when compressible... | 11/01/1988 |
| 4662831 | Apparatus for fracturing earth formations while pumping formation fluids Oil and other fluids are pumped from a well drilled into chalk or other difficult-to-produce formations by applying a back pressure to the formation concurrently with pumping fluid from the formation. One embodiment a pump suitable for performing the meth... | 05/05/1987 |
| 4648998 | Charge forming apparatus A charge forming apparatus or carburetor having a mixture passage and a throttle valve arranged therewithin. A fuel pressure control mechanism comprises a chamber from which controlled fuel is fed to the mixture passage. A flexible diaphragm defines one o... | 03/10/1987 |
| 4636150 | Low power electromagnetic pump An electromagnetic pump comprising a housing having a fluid receiving chamber in communication with an inlet, a pair of fluid chambers connected by a fluid bypass passage to accommodate bubbles, one in communication with the fluid receiving chamber and th... | 01/13/1987 |
| 4569641 | Low power electromagnetic pump An electromagnetic pump comprising a housing having fluid receiving and pumping chambers in communication with an inlet and an outlet, respectively, an electromagnet carried by the housing external to the fluid chambers, and a barrier in the form of a thi... | 02/11/1986 |
| 4568250 | Low power electromagnetic pump An electromagnetic pump comprising a housing having a fluid receiving chamber in communication with an inlet, a pair of serially-connected fluid pumping chambers, one in communication with the fluid receiving chamber and the other in communication with an... | 02/04/1986 |
| 4561828 | Pump for forwarding liquids A pump for forwarding liquids is described which has at least one pump chamber with inlet and outlet valves and also a plunger which periodically varies the volume of the pump chamber. To avoid the problems of dry running with very rapidly running pumps, ... | 12/31/1985 |
| 4557668 | Down hole pump having a gas release valve A downhole pump having a gas release valve which valve can be easily applied to the fixed barrel of a conventional downhole traveling plunger pump by merely lengthening such barrel. A trip on the pull rod attached to the plunger lifts off a valve element ... | 12/10/1985 |
| 4252507 | Hand-actuatable pump assembly An improved, hand actuatable pump assembly. A stem and piston assembly extend into a valve body. The piston sealingly engages the wall of the valve body and together they define a pressure chamber therebelow. The piston seals a discharge passageway in the... | 02/24/1981 |
| 4088425 | Manually operated pump for disposable container The vertical hollow sleeve of a pump has a bottom open end receiving the top open end of a container with fluid. A top section of the sleeve has a first vertical bore with a bottom surface communicating with the bottom thereof and contoured to receive a c... | 05/09/1978 |
| 4087212 | Traveling oil pump valve A conventional pumping unit is mounted at ground level, to which is attached a hollow sucker rod that extends through a tubing string to the production level of the well. Integral with the tubing string is provided a pump barrel, with communication betwee... | 05/02/1978 |
| 4050860 | Spray pump assembly A finger-operated spray pump assembly adapted to maintain a seal against leakage under substantially all conditions normally encountered by the pump. The assembly includes a compression chamber, a piston slidable in the housing, a grommet for holding the ... | 09/27/1977 |
