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| Number | Title | Issue Date |
| 4774108 | Methods of forming and using mat to obtain surface finishes Improved techniques are provided for obtaining a desirable surface finish of two or more visually distinct selected colors. A mat is prepared by selectively weaving wire between fixed pins on a board. Once removed from the pins, the mat may be molded abou... | 09/27/1988 |
| 4751876 | Method and apparatus for baking thin dough discs A baking oven embodying the method of this invention comprises a plurality of vertically stacked, vertically spaced heated baking plates. Every other one of the baking plates is periodically shifted from a horizontal baking position to an inclined dischar... | 06/21/1988 |
| 4747201 | Boosterless perforating gun A method and apparatus for effecting the assembly and arming a multisection perforating gun for a subterranean well. Each of the gun sections has a plurality of vertically and angularly spaced shaped charge containers disposed with the primer ends located... | 05/31/1988 |
| 4745938 | Outside seal and yoke valve A valve of the outside seal and yoke variety is provided, with a seal between a bonnet base and a valve body being axially spaced between a valve seating member and mating threads on the valve body and bonnet base. An end of at least one packing bolt is p... | 05/24/1988 |
| 4747085 | Method and apparatus for monitoring swimming pools A swimming pool alarm system is provided for actuating an alarm in response to the movement of a person in a swimming pool. The system includes a transmitter mounted below the surface of a swimming pool to continuously transmit ultrasonic sound waves thro... | 05/24/1988 |
| 4743033 | Dynamic seal assembly for piston and cylinder operating in subterranean wells A dynamic seal for effecting the sealing of a piston which is axially movable in a cylinder bore comprising a primary sealing element formed of a non-elastomeric sealing material having a hub portion secured to the piston element and an outwardly flaring ... | 05/10/1988 |
| 4738135 | Method and apparatus for in situ assemblage of a strain sensor in erected structural elements A method and apparatus for in situ drilling of a precise hole in an erected structural element and inserting in such hole in pressed-fit relationship a cylindrical strain gauge. A guide block is provided having a precision hole corresponding to the diamet... | 04/19/1988 |
| 4735732 | Filtration control additive for invert emulsion drilling fluids and method of preparation The present invention relates to a filtration control additive for use in invert emulsion drilling fluids; the method of preparing such additives; the invert emulsion drilling fluid produced therefrom; and a method of drilling, completing, and working ove... | 04/05/1988 |
| 4735266 | Method and apparatus for isolating a plurality of vertically spaced perforations in a well conduit A plurality of packing elements are mounted in vertically spaced relationship on a tubing string with the spacing of the elements corresponding generally to the spacing of a plurality of sets of perforations in a well conduit. The lowermost packing unit i... | 04/05/1988 |
| 4735909 | Method for forming a polycrystalline monolayer Improved techniques are provided for forming a very thin polycrystalline layer of a semiconductor material on a glass substrate. The film material may be formed from a slurry of a semiconductor powder and a liquid carrier, and the slurry economically appl... | 04/05/1988 |
| 4732682 | Aeration apparatus and method Improved methods apparatus are provided for introducing and entraining air into a waste liquid, thereby increasing the quantity of dissolved oxygen in the liquid to enhance the aerobic treatment process. A power driven propeller is preferably positioned a... | 03/22/1988 |
| 4732214 | Subsea production test valve assembly A subsea test assembly securable in a subsea blowout preventer stack is used in methods for performing wellbore tests and for disconnecting a tubular string from a subsea wellhead. The test valve assembly includes an upper subassembly releasably latched t... | 03/22/1988 |
| 4730835 | Anti-extrusion seal element A sealing assembly for effecting the sealing of an annulus between two telescopically related tubular conduits, of the type employed in subterranean wells, is achieved by utilizing annular seal backup elements dieformed from a knitted wire mesh by two suc... | 03/15/1988 |
| 4730670 | High temperature packer for well conduits A packer for effecting steam treatment of a production formation of a subterranean well comprises an insulated mandrel which is slidably inserted within the bore of an inner tubular body assembly. An outer operative tubular assembly surrounds the inner as... | 03/15/1988 |
| 4731533 | Method and apparatus for dissociating ions by electron impact Improved methods and apparatus suitable for use in mass spectrometry are provided for dissociating ions by achieving electronic excitation of the ions using electrons. In MS-MS applications, ion dissociation is induced by electron impact on an ion beam af... | 03/15/1988 |
| 4730183 | Multiple-mode data acquisition system A local data unit (10) provides sequenced acquisition and transmission of data signals received in different signal formats from local and remotely deployed sensors (24, 28). The network uses a microprocessor based stage (42) to sequentially control acqui... | 03/08/1988 |
| 4728444 | Filtration control additive for invert emulsion drilling fluids and method of preparation The present invention relates to a filtration control additive for use in invert emulsion drilling fluids; the method of preparing such additive; the invert emulsion drilling fluid produced therefrom; and a method of drilling, completing, and working over... | 03/01/1988 |
| 4724755 | Apparatus for forming and baking flat, thin discs of dough A combination pressing and baking mechanism is provided for converting balls of dough into thin, flat discs, such as tortillas. The pressing unit comprises a pair of relatively pivotally movable heated pressing plates. The lowermost pressing plate is disp... | 02/16/1988 |
| 4725839 | Remote, inductively coupled, transducer interface An exciter and detector circuit (A1, A2) is inductively coupled (18, 20) with a current conductor (B). The current conductor extends to a remote location at which it is inductively coupled (26, 30) with a remote transducer and encoder circuit (C1, C2). Th... | 02/16/1988 |
| 4722400 | Mechanically actuated subsurface injection tool An injection tool for use in injecting fluids into perforations of a production formation of an oil or gas well is mechanically set in the bore of the casing traversing the production formation, and mechanically releasable therefrom so that chemical treat... | 02/02/1988 |
| 4721157 | Fluid sampling apparatus An apparatus for extracting a virgin fluid sample from a selected formation of subterranean well comprises an outer tubular housing disposed between two packing elements straddling the selected formation and having radial ports communicating with the annu... | 01/26/1988 |
| 4715442 | Apparatus for servicing tubular strings in subterranean wells A tubing trip tool for use in determining the extent of defects in tubular sections of a continuous tubing string used in subterranean oil and gas wells is disclosed. The tubing trip tool is mounted on a surface rig surrounding the tubing string and defec... | 12/29/1987 |
| 4710712 | Method and apparatus for measuring defects in ferromagnetic elements A method and apparatus for determining the extent of defects in ferromagnetic tubular elements comprising a continuous string for use in an oil or gas well is disclosed. The tubing trip tool measures tubing average wall thickness, local defects, such as c... | 12/01/1987 |
| 4709758 | High temperature packer for well conduits A packer for effecting steam treatment of a production formation of a subterranean well comprises an insulated mandrel which is slidably inserted within the bore of an inner tubular body assembly. An outer operative tubular assembly surrounds the inner as... | 12/01/1987 |
| 4709727 | Pilot valve A pilot valve for effecting a control action selectively in response to the departures of the fluid pressure of a monitored fluid above or below a desired norm. Two axially spaced control fluid inlet ports in the valve body communicate with a valve chambe... | 12/01/1987 |
| 4709726 | Hydraulic coupler with floating metal seal An improved hydraulic coupler suitable for interconnecting subsea fluid lines is provided with a highly reliable metallic seal between the male and female portions. A C-shaped metallic seal is radially compressed between the female and male coupler bodies... | 12/01/1987 |
| 4710058 | Concrete lining machine An improved concrete lining machine is provided for lining the walls of a bored tunnel. The machine typically consists of three separable machine sections each having a frame and a plurality of supporting plates rotatable in an endless loop chain. Fresh c... | 12/01/1987 |
| 4708018 | Drilling mud density probe A self-cleaning probe for a drilling fluid or drilling mud density-testing apparatus comprises an elongated tube through which pressured air is supplied to a nozzle disposed in the mud-immersed end of the tube. A cleaning plunger is normally disposed in a... | 11/24/1987 |
| 4708208 | Method and apparatus for setting, unsetting, and retrieving a packer from a subterranean well Methods and apparatus are provided for retrieving an inflatable packer of a type which may be passed through a small diameter tubing, seal against a relatively large diameter casing by passing fluid to the packer through a remedial tubing, and then be ret... | 11/24/1987 |
| 4708200 | Apparatus for maintaining clean fluid in a chamber in a subterranean well tool A fluid pressure activated firing head for a perforating gun disposed in a subterranean well by a packer is provided with a column of clean fluid overlying and filling the bore of the firing head but communicating with the casing annulus above the set pac... | 11/24/1987 |
| 4704580 | Method and apparatus for measuring the depth of local defects in ferromagnetic elements A method and apparatus for determining the extent of defects in ferrogmagnetic elements, such as tubing comprising a continuous string for use in an oil or gas well is disclosed. The tubing trip tool measures the depth of local defects, such as corrosion ... | 11/03/1987 |
| 4698590 | Method and apparatus for measuring velocity of ferromagnetic tubing A tubing trip tool for use in determining the extent of defects in tubular elements comprising a continuous string used in a subterranean oil or gas well during removal of the string from the well is disclosed. Local defects and axially extending defects,... | 10/06/1987 |
| 4694692 | Drilling fluid density measurement system A drilling fluid density measurement system uses a continuously operating bubble measurement system for an oil or gas well. A microprocessor correlates the signal output from a differential pressure transmitter connected to a pair of self-cleaning pressur... | 09/22/1987 |
| 4691384 | Intrinsically safe multi-drop communications link A multi-drop communication link, consisting of a master and a plurality of slaves is intrinsically safe for use in a hazardous environment. Slaves are in parallel and communicate with the master through transmit and receive shunt-diode safety barriers. An... | 09/01/1987 |
| 4691155 | Automatic load seeking control for a motor Method and apparatus for matching the power output of a high slip motor to the demand requirement of a pumpjack unit. The stators of the high slip motor are automatically connected in various different configurations to provide the optimum torque as requi... | 09/01/1987 |
| 4686694 | Probe for an apparatus for analyzing metals by X-ray fluorescence An apparatus for analyzing metal alloys includes an electronic unit connected to a hand-held probe unit. The probe unit includes a radiation detector enclosed in a detector housing and a radiation source enclosed in a source housing. The detector housing ... | 08/11/1987 |
| 4676139 | Valve mechanism for operating a piston within a cylinder A valving mechanism for a cylinder-piston unit wherein the extreme positions of the piston are not positively controlled by a crankshaft or similar device. Inlet and exhaust valves are respectively mounted in a cylinder head and are operated by actuating ... | 06/30/1987 |
| 4674575 | Sealing system for downhole well valves A sealing system for a valve disposed downhole in a subterranean well and subject to a high-temperature and high-pressure environment, comprises an annular valve seat defining a primary annular metallic seating surface surrounded by a groove within which ... | 06/23/1987 |
| 4673652 | Method of testing and reconditioning insulating tubular conduits A non-destructive on-site method of inspection, and testing of the insulating performance and reconditioning of a concentric insulating tubular conduit member is disclosed. The insulating tubular conduit members comprise concentric walled members with an ... | 06/16/1987 |
| 4672728 | Pressure signal instrumentation having removable flanges and mounting method therefor An instrument manifold and pressure transducer are provided for detecting a pressure differential across an orifice fitting. Removable flanges are utilized on the output side of the orifice fitting, and on the input and the output ends of the manifold. Ea... | 06/16/1987 |
