The Goodyear & Tire Rubber Company

Other

Schlumberger Industries

Charles W Roberts

Michael Alois Kolowski

Harold D Fetty

Daniel J Lindner

John E Lynch

Terrence M Ruip

Samuel P Landers

Thomas K Gaylord

Elias N Glytsis

Gregory H Henderson

R Wendell Goodwin

Lawrence C West

Stephen Lash

Henry T Kwee

Moses T Asom

Homer B Lowther

An air-coupled current transformer is provided with a primary current conductor and two secondary coils connected such that the emf induced in each coil by an external disturbing magnetic flux is subtractive, whereas the emf induced by the current in the primary is additive. Two ferromagnetic core pieces enhance the rejection of the emf induced by the disturbing flux. Ceramic spacers are inserted into air gaps between the core pieces for maintaining the gaps fixed to keep the scale factor of the transformer independent of temperature.

Unshielded air-coupled current transformer

A solid state, electronic, optical transition device includes a multiple-layer structure of semiconductor material which supports substantially ballistic electron/hole transport at energies above/below the conduction/valance band edge. The multiple layer structure of semiconductor material includes a Fabry-Perot filter element for admitting electrons/holes at a first quasibound energy level above/below the conduction/valance band edge, and for depleting electrons/holes at a second quasibound energy level which is lower/higher than the first energy level. Such an arrangement allows common semiconductor material to be used to produce emitters and detectors and other devices which can operate at any of selected frequencies over a wide range of frequencies.

Semiconductor devices based on optical transitions between quasibound

A portable fluid collection and removal apparatus includes an elongated flexible conduit having a generally circular outer wall provided with a perforated flat bottom wall. The inner passageway of the conduit is filled with fluid absorbent material whereby fluid beneath the conduit is drawn upwardly through the perforated bottom wall, into the absorbent material. Wicks leading from the interior fluid absorbent material extend through the flat bottom wall perforations and project outward to expand the area of absorbency by capillary action. Passageways between plural exterior walls transmit auxiliary fluids to warm the conduit to prevent freezing while, a plurality of the conduits may be assembled in a laterally juxtaposed manner to form a blanket.

Evacuation hose for fluids

A rubber article (A) has a design (12) outlined by a serrated portion including a plurality of ribs (22) which are separated by grooves (20). The ribs and grooves are located in a surface (10) of the article (A) and the design (12) is defined by a substantially flat ungrooved portion of the article surface. The ribs (22) extend no further outwardly than the article surface (10).

Serrated outline marking for a tire side wall

This invention comprises a process for molding a three dimensional decorative article where cored out or raised portions extend to a depth of at least 0.6 centimeter, said process comprising generating electronically a line drawing of said article and electronically displaying the drawing; photographing said drawing to form a photographic transparency; positioning said transparency over a layer of a liquid photopolymer having a depth greater than 0.6 centimeter; exposing said photopolymer through said transparency to actinic light to set the photopolymer; and removing the liquid from the set photopolymer to form a three dimensional article having the appearance of said drawing.

Method of making a sight model

A tread capable of being used in all seasons and weather conditions comprising of a substantially centrally located rib which extends circumferentially about the tire, a plurality of independent projections placed about the remaining portion of the tire. The independent projections are placed so as to provide for two circumferentially extending grooves, one on either side of the central rib and a plurality of laterally extending grooves which extend from each central groove to the tread edge of the tire. The tread has a low net to gross ratio.

Tread for pneumatic tire

A tread for a pneumatic tire having a plurality of circumferentially spaced independent projections. The tread has three narrow zones which extend circumferentially about the tire; a central zone and two shoulder zones. The depth of the recesses in between the independent projections in these zones is substantially less than the depth of the recesses in between the projections in the remaining portion of the tread.

A tread for a pneumatic tire having a plurality of circumferentially spaced independent projections, each projection has an outer configuration which is basically triangular as viewed in a plane perpendicular to the tread. The projections in the central portion of the tread are oriented such that the leading edges form an angle from about 30.degree. to 60.degree. with respect to the mid-circumferential plane of the tire, and the projections in the shoulder portions are oriented such that the leading edges form an angle from about 30.degree. to 70.degree. with respect to the mid-circumferential plane of the tire.

Indicia of enhanced visibility for rubber articles, and particularly for tires, are formed by a series of substantially straight lineal projections of the same approximate cross section integral of the article. The projections are continuous within the configuration of each indicium. Each indicium may include raised borders and/or may in total be raised above the surface of the article immediately surrounding the indicium. The cross-sectional width of a projection is from about 30 percent to 70 percent of the distance between the longitudinal axes of adjacent projections. To further enhance visibility dirt-retaining projections may be employed.

Growing community of inventors

Akron, OH, United States of America

Charles W Roberts