Abstract:
A two stage process for the production of polybenzimidazoles and a novel polybenzimidazole produced there by is provided wherein a mixture of an aromatic tetraamine, e.g., 3,3',4,4'-tetraaminobiphenyl and a free dicarboxylic acid, e.g., isophthalic acid, is heated with agitation in a first stage to a temperature above the melting point of the tetraamine until the viscosity of the mixture rises as indicated by an agitator torque of at least 1.5 times that before the rise in viscosity. The agitation is then discontinued and the reaction mixture is allowed to foam while heating is continued. The foam is then allowed to cool to a friable mass and is crushed to a ground prepolymer which is heated with agitation in a second stage until the desired polymer is obtained. The novel polybenzimidazole produced is the reaction product of phenylindandicarboxylic acid and 3,3',4,4'-tetraaminobiphenyl.
Abstract:
A waiter/table control module adapted for data input to an ECR which identifies the waiter operating the cash register by means of a key like device which cooperates with an electronic device to generate a binary expression representing the waiter to whom the key is assigned and further identifies the tables against which the sale is to be recorded by means of a keyboard matrix having a key for each table and a light within the key.
Abstract:
A process and equipment for dispelling fog from the atmosphere in order to improve visibility, the process consisting of discharging a compound into the fog that develop heat within the fog air mass so as to cause a convection current thus lifting the fog.
Abstract:
The disclosure relates to a polymeric or similar reclosable specimen package or bag wherein the bio-hazard symbol is printed, typically sideways, on the tear zone. This provides for obliteration of the bio-hazard symbol upon opening of the package and the disposal, if appropriate, of the specimen package or bag in regular trash.
Abstract:
A web server includes software to support a remotely accessible web portal for installation and repair services in conjunction with a telecommunication service provided to a customer by a provider. The software includes instructions to provide a first I&R user interface, including a plurality of selectable I&R objects in response to a first input from a remote field device, receive a second input from the remote field device indicating a user's selection of one of the I&R objects, generate a request to invoke an I&R application in response to receiving the input, transmit the request to invoke the I&R application to an I&R system, receive I&R data generated by the I&R application from the I&R system, and convey information indicative of the I&R data to the remote field device.
Abstract:
Melt blown bicomponent fibers comprising a sheath of polyethylene terephthalate or a copolymer thereof and a core of nylon 6,6 and a reservoir or a nib in a writing or marking instrument comprising a porous element formed from such fibers bonded to each other at spaced points of contact. For use as a nib the core polymer may also be polybutylene terephthalate.
Abstract:
HIV protease inhibitors inhibit or block the biological activity of the HIV protease enzyme, causing the replication of the HIV virus to terminate. These compounds can be prepared by the novel methods of the present invention using the novel inventive intermediates.
Abstract:
HIV protease inhibitors inhibit or block the biological activity of the HIV protease enzyme, causing the replication of the HIV virus to terminate. These compounds can be prepared by the novel methods of the present invention using the novel inventive intermediates.