Abstract: A plurality of steel rings are crimped or shrink fitted onto a joint of steel well casing to produce the casing anchor. The rings and joint are sufficiently interlocked so that, when the anchor is cemented in a well, the joint can transfer axial load from the casing string to the cement through the rings to provide resistance to axial displacement of the anchor relative to the surrounding earth material.

Abstract: An authentication system of a terminal on a public switched telephone network provides a security node associated with a local exchange and a network terminal. For one-way authentication, the terminal responds to a call initiation by sending a unique authentication code comprising a number and a secret key encrypted according to a first algorithm, the secret key being specific to the terminal. The security node constructs the expected authentication code from the number, using the first algorithm and a second key which is a function of a terminal identification number, and compares the expected code with the received code. In two-way authentication, the security node responds to the call initiation by sending a transaction number to the terminal encrypted according to a second algorithm. The terminal generates the authentication code as a function of the first algorithm, the secret key and the transaction number. The authentication code is sent back to the security node.

Abstract: A method for preparing casing for use in a wellbore such as for example, in preparation, for use to line a borehole through a formation or to act as a drill string and thereafter to remain in hole. In the method, a device supporting the use of the wellbore casing is crimped onto the outer surface of the casing. The device supporting casing use can be to facilitate run in through the borehole, to maintain positioning relative to the borehole, to accommodate wear against the wall of the borehole into which the casing is run or to enhance the results of cementing. The devices supporting the use of the casing are attached by crimping to the casing to create a connection having structurally significant axial and torque load transfer capacity.

Abstract: A composition comprising 2-alkylthio- or 2-aryl(heteroyl)thio-substituted p-phenylenediamine, its method of preparation, and its use as an antidegradant in natural or synthetic rubber.

Abstract: The invention comprises a process for preparing a compound having the formula comprising: 1

Abstract: The present invention relates to a heat exchanger which comprises a flexible sheet consisting of a porous material, such as polyvinyl alcohol, sandwiched between two liquid impermeable layers, the liquid impermeable layers defining between them and between fluid-tight edges, a liquid transfer space within said sheet and at least one liquid inlet and at least one liquid outlet for respective connection to a source and a drain of a heat transfer liquid, with a flow path defined between the liquid inlet and liquid outlet within said liquid transfer space.

Abstract: Thick-walled steel pipe is corrugated for the purpose of managing axial load when the pipe is used in an earth-restrained application. For example, the pipe may be used as casing in a cyclic steam stimulation well, where the axial loads are induced as the casing is heated and cooled.

Abstract: A supervisory arrangement for a networked multimedia computing system provides features which facilitate the use and control of the networked system. One disclosed feature enables slave workstations to request attention from a master station. At the master workstation, multiple requests are prioritized in order of receipt, so that a supervisor or administrator is prompted to respond to the oldest pending request. As soon as the request is responded to, for example by audio communication with the slave station, the request is automatically cleared without the need for any input by the administrator or the person who made the request.

Abstract: A plurality of steel rings are affixed, as by crimping using hydroforming means, to the outside of a joint of steel well casing. The rings are distributed in spaced relation along the joint. The resulting anchor joint is run into a well as part of the casing string and cemented in place.

Abstract: A method and apparatus for removing an item of shaped clay from a mould. The method including holding the piece (14) on a synthetic mould (10), pressing it against a resilient member (18) such that the member (18) substantially adopts the shape of the piece (14), and blowing the piece (14) off the mould (10), at which time the member (18) is compressed a little further to receive the clay (14) off the mould (10).

Abstract: A supervisory control system for a networked multimedia computing system includes an observation feature which enables a teacher, or other supervisory person, to observe a reduced view of multiple workstations at one time. The teacher is provided with a good representation of the entirety of each of the multiple screens, which enables the teacher to comprehend the type of subject matter currently being viewed by the student. If a particular student's screen is of interest, the teacher can readily select that student's screen and obtain a full-sized view thereof. In this mode, the teacher also has the option to control the student's workstation. If the number of students selected for observation is greater than the number of screens that can be presented at one time, the observation function cycles through groups of compressed screens, to permit the teacher to view all students of interest.

Abstract: The detection method and apparatus detects abnormalities having a first signal propagation property within a host medium having a second signal propagation property based upon signals which have been reflected, scattered and/or absorbed by the host medium and any abnormalities therein. The detection apparatus includes a signal source for introducing a signal into the host medium which varies with respect to a predetermined signal parameter, such as time, frequency or source location. The detection apparatus also includes a plurality of detectors disposed along some or all of the boundary of the host medium for detecting the signal following propagation through the host medium and any abnormalities within the host medium. The detection apparatus further includes a signal processor for constructing at least one partial differential equation to describe the propagation of a regularized signal through a medium having the same shape as the host medium.

Abstract: A method of removing a piece of shaped clay from a mold. The method comprising locating a former against the shaped clay on the opposite side thereof to the mold, with the former being shaped to correspond substantially to the shape of the clay to provide a close fit thereagainst. Fluid such as air is blown through the mold to blow the shaped clay thereof and on to the former.

Abstract: A hairbrush, the surface of which changes colour with temperature, is used to improve the set of human hair during a grooming process. The bristles of the brush may be of a colour temperature dependent nature as well as the surface on which the bristles are mounted or protrude.

Abstract: A method for providing security in a networked multimedia computing system is provided wherein an administrative workstation is challenged by a network workstation when the administrative workstation is attempting to manipulate or query the network workstation. The administrative workstation responds in an automatic fashion to supply a series of logically acceptable password candidates to the challenging workstation in an attempt to validate itself to the challenging network workstation without interrupting a user. If none of the series of passwords is successful, an administrator, or user, operating the administrative workstation is prompted to manually enter a password. The system allows for an administrative workstation to automatically and transparently validate itself to a challenging network workstation, in most situations, without requiring input from the administrator.

Abstract: A graphical user interface for a computer includes an arrangement of icons that provides for a large number of icons to be present on screen while maintaining a large amount of useable screen space. An icon text description setting out the icon's function is provided adjacent to each icon. The icon text description is presented in truncated form when the icon is not designated by a cursor. When the icon is designated by a cursor, the icon text description is expanded to a full length thereby more fully describing the icon's function. When an icon is designated by a cursor, the text descriptions for undesignated icons are blanked, thereby focusing attention on the designated icon. This arrangement has the desirable effect of providing a user with a ready means of identifying or reaffirming icon function while avoiding the consumption of useful screen space.

Abstract: A supervisory control system for a networked multimedia computing system that addresses the foregoing limitations associated with currently existing systems provides a teacher or network administrator at a master workstation with the ability to open a specified document on selected remote workstations in the network. If the document is not already present on the various remote workstations, the teacher can first transmit it to each one that does not already have it. At the remote workstations, the document is stored at the same location as it is in the master workstation, to facilitate finding it on subsequent occasions. When a command is sent to open the document, it is identified by specific attributes that enable it to be distinguished from other documents that may have the same name. With this feature, a teacher can easily reset an entire computer lab so that each student will be at the same position for the beginning of a new class, for example.

Abstract: A supervisory control system for a networked multimedia computing system permits a teacher or network administrator to quickly and easily update system software on selected destination workstations with the system software currently residing on the master workstation. In one mode of operation, only basic system software is updated, while user-defined preferences are unchanged. In a second mode of operation, both the system software and all user-controlled settings are replaced, to permit the remote workstations to be configured in a desired manner.

Abstract: A flow-sensing pitot tube is disclosed for mounting in a conduit for indicating the rate of fluid flowing in the conduit. The tube has forward openings facing up-stream for sensing dynamic pressure, and multiple static pressure sensing openings, including a pair disposed at an angle of 110 degrees rearwardly of the forward openings, for sensing static pressure. Pressures sensed by the forward and rear openings are used to indicate volumetric flow by using a flow coefficient that is substantially independent of the Reynolds Number of the fluid.

Abstract: A flow-sensing probe adapted to be mounted in a conduit for indicating the flow rate of a fluid passing through the conduit. The probe has forward openings facing in the direction of fluid flow, and rear openings disposed at an angle of about one hundred and ten degrees with respect to the forward openings. Pressures sensed by the forward and rear openings are used to indicate volumetric flow by using a flow coefficient that is independent of Reynold's number.