Abstract: This invention pertains to an improved artificial shrub or tree and the method for constructing same. The invention improves upon all prior art artificial shrubs or trees by providing for a marketedly authentic series of branches which extend from the trunk or main body of the growth and improves upon all prior art structures through the use of an intermediate adapter shaped in the form of a branch which has its thickest end extending from the trunk and which becomes increasingly thinner as it approaches the cantilever end thereof. The adapter produces an authentic branch appearance in comparison to prior art branches which generally have little if any diminishing thickness extending from the supporting end and which are simply bluntly stuck into a bore in the trunk.

Abstract: A well screen having slurry flow paths enclosed therein includes support rods extending in the axial direction of the screen disposed cylindrically at a predetermined interval in the circumferential direction of the screen, a wire wound on the outer periphery of said support rods so as to form slits of a predetermined width, one or more flow paths for gravel-containing slurry provided inside of the wire and extending in the axial direction of the screen, and openings for communicating the flow paths with the outside of the screen. Lowering and lifting of the screen through a wellbore can be made smoothly without interfering of the slurry flow paths with the wellbore and installation of the screen can thereby be facilitated.

Abstract: Disclosed is a heat exchanger tube bundle design that eliminates the need for tube supports or baffles within a heat exchanger tube bundle. The inventive configuration uses a combination of bare tubes and longitudinally finned tubes positioned such that the longitudinal fins act as spacing and supporting means within the tube bundle. The longitudinal fins provide spacing and support substantially along the entire length of the tubes within the bundle and eliminate the need for internal spacing or supporting means. Taking advantage of this inventive design, one can economically construct a tube bundle requiring only external rings to secure the tube bundle.

Abstract: A maintenance screen for use in low-velocity, shallow or horizontal or slightly inclined wells is disclosed. The maintenance screen of the present invention utilizes a generally downwardly oriented portion through which fluid can pass and a generally upwardly oriented portion which does not allow sand or fluid to pass therethrough, so that sand naturally gravitates downward through the fluid and away from the portion of the screen through which the fluid may pass to enter the well tubing.

Abstract: Disclosed is a device for supporting and spacing the tubes within a heat exchanger comprised of a plurality of V-shaped stiff wire rods. Each of the V-shaped wire rods includes a pair of leg portions and a concave intermediate section. The inside radius of the concave intermediate section is substantially equivalent to one-half of the tube outside diameter. Six of the V-shaped stiff wire rods are affixed to one another to form a spacer having a substantially hexagonal opening wherein each side of the hexagonal opening is one of the concave intermediate sections. At each apex of the substantially hexagonal opening there extends radially outward legs from two of abutting V-shaped stiff wire rods.Thus formed, the spacer of the present invention provides a structurally sound tube supporting device while limiting the obstruction to flow of shell side process fluid.