An offset printing apparatus rotates the plate cylinder steadily with a minimum of torsional interference caused by impact of the reciprocating ductor roll with the vibrator roll. The vibrator roll is driven to rotate independently of rotation of the other rolls which lead successively to the plate cylinder.

A solid state relay includes a protective input stage at its control terminals to isolate the control circuit from line voltage or line current in the event of relay failure. The protective circuit includes a series combination of a voltage responsive element and a current responsive element. The current responsive element connects to the input or control terminal of the solid state relay and the voltage responsive element connects to ground. The interconnection of the current responsive element...

Described is a purified osteogenic factor that when delivered to bone in association with a physiologically acceptable delivery vehicle is capable of inducing new bone growth at the bone surface. The osteogenic factor is water soluble, and is characterized physically by a molecular weight of about 2.5 kD when measured by gel filtration under dissociating conditions and an isoelectric point in the pH range from about 4.6 to 7.2. Use of the purified factor in treating bone defects is described. Al...

An isolated rim roller assembly guides and supports portions of the endless track of a track-type vehicle as that portion of the track travels between a drive wheel and an idler wheel of the vehicle. The metallic rims of the roller assembly are isolated from the roller shell by cushioning rings which are bonded to the rims and the roller shell. Noise and vibration generated by the metal to metal contact between the endless track and the rims is isolated from the remainder of the roller assembly ...

An electrically-erasable, electrically-programmable ROM or an EEPROM is constructed using a floating-gate transistor with or without a split gate. The floating-gate transistor may have a self-aligned tunnel window of sublithographic dimension positioned on the opposite side of the source from the channel and drain, in a contact-free cell layout, enhancing the ease of manufacture and reducing cell size. In this cell, the bitlines and source/drain regions are buried beneath relatively thick silico...

Individual stages of a multistage electronic receiver include a pair of conductive isolation regions around each stage to isolate each stage from the other stages and thereby prevent feedback and external noise problems. Each pair of isolation regions includes a P+ ring and an N+ ring adjacent to each other to shunt hole carriers and electron carriers, respectively. Removal of the carriers does not have to wait for recombination of the carriers. The region which has the same conductivity type as...

A hand-held power-driven tool for operating a work member in conditions in which fairly extreme vibrations are generated is constructed of rigid parts isolated from each other by elastomer shock-absorbing material arranged between the parts in laminar fashion in which certain of the layers are of different Shore A hardness as respects each other. The layers are also formed with different thicknesses and are introduced into an annular space between the parts in pourable condition, each layer bein...

A drive sprocket assembly for driving an endless track chain assembly for propelling a vehicle includes a support hub, which is mountable to the power drive system of the vehicle, and a plurality of replaceable sprocket segments which are secured to the support hub. Each sprocket segment includes replaceable teeth which are resiliently isolated from the other components of the sprocket segment by a plurality of non-metallic resilient discs, thus reducing noise generated by the sprocket teeth str...

An isolated optical coupler arrangement is disclosed which is capable of providing a pump signal and a message signal to a fiber amplifier. The coupler comprises a pair of lenses with a wavelength selective device disposed therebetween. The wavelength selective device is chosen to reflect the pump signal applied as an input to the first lens, and transmit the applied message signal. An optical isolator is inserted in optical path between the wavelength selective device and the second lens to fur...

A rotary hand-held powered tool such as a grinder has an outer casing of rigid material and formed with a cavity in which is disposed a motor housing isolated from the casing by elastomer shock-absorbing material of the type that is pourable into the bell-shaped space between the motor housing and interior of the casing and which subsequently cures to become bonded to the interior surface of the casing and to the outer surface of the motor housing. The elastomer material is introduced to the bel...