Each network node in a communications network maintains its own copy of the network topology database defining network resources. Each resource record contains a "timer" field which is initially set to a maximum value but which may be decremented on a daily basis. If the timer field is decremented to zero without being reset, the node unilaterally removes the resource record from its copy of the database. The timer field will normally reach zero only for obsolete resource records since each netw...

Apparatus for maintaining a permanent wave upon hair growth without reprocessing previously waved hair, including a core or spool for winding up a previously waved hair end portion and having a spool enlargement on one end, an enclosure having an opening and a slot extending from the opening for receiving the hair wound spool with the enlargement closing the enclosure opening and the hair extending through the slot, and a flexible seal along the slot retained in closing engagement therewith by e...

In an electrostatographic copier in which imaging material is transferred from an image support surface to an overlying copy sheet in a transfer station by electrical transfer charges, the variable leakage conduction of these transfer charges by the copy sheet away from the transfer area (to contacting conductive members) changes the available transfer field strength, thus affecting transfer efficiency and quality. Here the conductive members contacting the copy sheet while it is in the transfer...

Method and apparatus for maintaining a road or the like wherein liquid asphalt cement and aggregate are separately carried to a job site. The temperature of both of these is maintained within a range of from about 70.degree. F. to about 250.degree. F. for the aggregate and a range of from about 100.degree. F. to about 195.degree. F. for the liquid asphalt cement. The aggregate is metered onto delivery means and delivered thereby to a mixing means. The liquid asphalt cement is pumped from its con...

A width-maintaining cylinder having at least one bearing arranged on a support at an angle to the longitudinal axis thereof. The bearing has a flange and a circular cylinder bearing surface for a small wheel set at an angle. The bearing has contact surfaces on both sides and can be clamped on the support between two tensioning elements. The contact surfaces of the bearing which can be pressed against one another are at right angles to the longitudinal axis of the support.

A camber-maintaining structure for a motor vehicle front wheel. The structure consists of a T-shaped bracket rigidly attached to the horizontally pivoted A-frame of the vehicle. A rigidly clamped cross bar and pulley are slidably and pivotally connected to the stem of the bracket. A cable is engaged around the pulley and its ends are attached to the backing plate of the brake drum of the adjacent wheel. A pair of coiled springs connect the ends of the cross bar to the ends of the head portion of...

Container transporting and maintaining apparatus is disclosed adapted to be mounted to a container-handling vehicle. The apparatus comprises a ramp and a boom, and means for reciprocally moving an end portion of the boom along a path extending adjacent the ramp with at least a portion of the path approaching the ramp. Container-gripping means are pivotally mounted to the boom end portion. Support wheel means are rotatably mounted to the container gripping means to roll upon the ramp as the boom ...

A position detecting and maintaining apparatus for use between a movable article and a movable base member. Track means are provided and extend parallel to the direction of movement of the movable article and guide means are provided for guiding the base member along the track means. A shaft is rotatably supported on the base member and has a lever fixed thereto and rotatable therewith and adapted to engage the article to effect a rotation of the shaft means upon a relative movement between the ...

A single-mode, polarization-maintaining optical fiber has both excellent signal attenuation and resistance to adverse bending effects because (1) its cladding and any portion of the jacket that is within five times the radius of the mode-field in its core have a substantially uniform index of refraction that is at least 0.005 less than that of pure silica, and (2) the index of refraction of the core is at least as great as, but preferably not substantially greater than, that of pure silica. Pref...

An apparatus is described that has been created to maintain a constant level of saturation of water near the foundation of houses, buildings, or the like. The maintenance of such a level of moisture is essential to the structural integrity of foundations especially in those geographic locations where the level of soil moisture varies significantly from season to season. Soil, when it absorbs water, expands. This soil can exert tremendous pressure on the foundation of a house. To prevent cracking...