Abstract: An ultrasonic orthodontal monitoring system and method of use is described herein, featuring an intraoral ultrasonic transducer and an ultrasonic monitoring apparatus configured to connect to the intraoral ultrasonic transducer, generate and send electrical pulse signals to the intraoral ultrasonic transducer, receive measured signals from the intraoral ultrasonic transducer, and generate time-of-flight and relative density based on the measured signals. This invention will permit routine measurements to be made of osseointegration by the patient's dentist during regular maintenance appointments, thereby reducing the risk of a failed implant, patient discomfort, and inconvenience. As a diagnostic tool, it can also aid in the diagnosis and treatment of progressive periodontal disease, peri-implantitis, and osteoporosis in edentulous patients.

Abstract: An apparatus for processing feed stock into a thixotropic state. The apparatus includes a barrel with first, second and nozzle sections. The first, second and nozzle sections are connected together and include surfaces that cooperatively defining a central passageway through the barrel. The first section is constructed of a first material, the second end section is constructed of a second material and the nozzle is constructed of a third material. The first material exhibits a greater resistance to thermal fatigue and thermal shock than the second material while the nozzle section includes a bushing which inhibits heat transfer to the die, precluding excessive molding pressures and cycle times. The apparatus also includes a preheater for preheating the feed stock before entry into the barrel, a thermal gradient monitoring system, a novel robust nozzle construction, and a two-stage embodiment of the apparatus.

Abstract: An apparatus for processing feed stock into a thixotropic state. The apparatus includes a barrel with first, second and nozzle sections. The first, second and nozzle sections are connected together and include surfaces that cooperatively defining a central passageway through the barrel. The first section is constructed of a first material, the second end section is constructed of a second material and the nozzle is constructed of a third material. The first material exhibits a greater resistance to thermal fatigue and thermal shock than the second material while the nozzle section includes a bushing which inhibits heat transfer to the die, precluding excessive molding pressures and cycle times. The apparatus also includes a preheater for preheating the feed stock before entry into the barrel, a thermal gradient monitoring system, a novel robust nozzle construction, and a two-stage embodiment of the apparatus.

Abstract: Novel compositions of matter comprise polymeric materials containing, as a filler therefor, a semiconducting pyropolymeric inorganic refractory oxide material, said compositions being useful in situations which require items such as electrically conductive sheets which possess a given electrical resistance.

Abstract: Novel compositions of matter comprise polymeric materials containing, as a filler therefor, a semiconducting pyropolymeric inorganic refractory oxide material, said compositions being useful in situations which require items such as electrically conductive sheets which possess a given electrical resistance.

Abstract: An ink supply system for an ink jet, or an array of ink jets, is disclosed in which an on-off valve is interposed in the conduit between the ink reservoir and the droplet forming nozzle, and a second source of ink under pressure is connected through a normally closed valve to the conduit between the nozzle and the on-off valve. To initially prime the nozzle, the on-off valve is closed, a vacuum pulled on the nozzle, and the valve opened to fill the conduit and nozzle. To reprime or clear obstructions such as dirt particles, the on-off valve is closed and the normally closed valve briefly opened to send a pulse of ink to and through the nozzle. With both valves closed during shipping or storage, the likelihood or ink being dislodged from the nozzle or conduit so as to deprime the nozzle is minimized.

Abstract: A method of making conductive material for a conducting device. The material is formed by reacting an organic pyrolyzable substance in the presence of a refractory oxide having a surface area of from about 1 to about 500 square meters per gram in a non-oxidizing atmosphere at a temperature of at least 400.degree. C.

Abstract: A ceramic material characterized by a high degree of resistance to failure by thermal fracture which comprises a composite of a refractory oxide and flaked boron nitride. The boron nitride flakes are incorporated into a refractory oxide matrix as an inert, nonreactive, uniform dispersed phase in proportions sufficient to provide the oxide composite with an increased resistance to thermal shock.

Abstract: Electrical resistor inks comprising a mixture of at least one semi-conducting pyropolymeric inorganic refractory oxide material and a vehicle consisting of a binder such as a synthetic resin or a varnish, and a suitable solvent or oil, etc., are useful in forming resistors in electrical circuits, especially on printed circuit boards and on the ceramic substrates used for thick film circuits. In addition, the ink may contain other components such as metal powders, anti-skinning agents, drying agents, colored pigments, waxes, etc.

Abstract: Improved forms of electric resistance elements or resistors may be made from semiconducting organic-refractory oxide fibers, as for example drawn alumina fibers which have been subjected to contact with a pyrolyzable organic substance at a temperature above about 400.degree. C. A few, or a large number of the semiconductive fibers, can be used in a group or bundle form to provide a desired resistance for a particular resistor. A preferred form of resistance element will cover the fibers in a quartz tube or other suitable encapsulating material to preclude moisture problems.

Abstract: Electrical resistor inks comprising a mixture of a semi-conducting pyropolymeric inorganic material and a transition metal oxide along with a vehicle consisting of a binder such as a synthetic resin or a varnish and a suitable solvent or oil, etc. are useful in forming resistors in electrical circuits, the resistor ink possessing a temperature coefficient of resistance of less than about 500 ppm/.degree. C.