Dale Pershing Fosdick

US Patent:

D2504154, Nov 28, 1978

Filed:

Jan 13, 1977

Appl. No.:

5/763805

Inventors:

Borje O. Rosaen - Ann Arbor MI
Dale P. Fosdick - Ann Arbor MI

International Classification:

D2301

US Classification:

D23 4

US Patent:

42996961, Nov 10, 1981

Filed:

Mar 4, 1980

Appl. No.:

6/127227

Inventors:

Borje O. Rosaen - Ann Arbor MI
Dale P. Fosdick - Ann Arbor MI

International Classification:

B01D 2710
B01D 3502

US Classification:

210120

Abstract:

A fluid filtering device is provided which is particularly suitable for connection with the suction line of a hydraulic pump. The fluid filtering device comprises an elongated tubular cylindrical housing open at each end and which has at least its lower end submerged in a reservoir of the fluid to be filtered. An elongated filter assembly includes an extension tube and tubular cylindrical filter element detachably coaxially connected at one end to the extension tube. The filter assembly is axially insertable into the housing so that the filter element is positioned below the fluid level of the reservoir. Upon insertion, both axial ends of the filter element sealingly engage the interior walls of the housing while the filter element is spaced radially inwardly from the housing and thus forming an annular outlet chamber. Fluid flows from the bottom housing, through the filter element, to the annular chamber and out through a fluid connector open to the annular chamber. Preferably, a differential pressure responsive bypass valve is fluidly connected between the annular chamber and the reservoir wherein said bypass valve opens upon a predetermined differential pressure across the filter element.

US Patent:

43728553, Feb 8, 1983

Filed:

Apr 29, 1981

Appl. No.:

6/258670

Inventors:

Borje O. Rosaen - Ann Arbor MI
Dale P. Fosdick - Saline MI

International Classification:

B01D 2910

US Classification:

210316

Abstract:

A fluid filtering device comprising a housing having an axis and defining an interior chamber. In one preferred embodiment a fluid inlet port is formed at one end of the housing which is open to the chamber while a fluid outlet port is formed on one side and is also open to the chamber. A filter element is positioned within the chamber between the inlet port and the outlet port. A first air bleed conduit within the housing has one end positioned within the outlet port and its other end positioned at the upper portion of the chamber when the housing is substantially vertically oriented. A second air bleed conduit within the housing also has one end within the outlet port and three openings at its other end. One of these three openings is at the uppermost portion of the chamber when the housing is in a corresponding one of three substantially horizontal positions. In a further form of the invention fluid passageways extend directly from a fluid outlet port formed at one end of the housing and one end of an annular inlet chamber surrounding the filter element.

US Patent:

41674839, Sep 11, 1979

Filed:

Jul 10, 1978

Appl. No.:

5/922979

Inventors:

Borje O. Rosaen - Ann Arbor MI
Dale P. Fosdick - Ann Arbor MI

International Classification:

B01D 2710

US Classification:

210130

Abstract:

A fluid filtering device is provided which is particularly suitable for connection with the return or pressure line of a hydraulic system. The fluid filtering device comprises an elongated tubular cylindrical housing open at each end and which has at least its lower end submerged in a fluid reservoir. An elongated filter assembly includes an extension tube and a tubular cylindrical filter element coaxially connected at one end to the extension tube. The filter assembly is axially insertable into the housing so that the filter element is positioned at least partially below the fluid level of the reservoir. Upon insertion, both axial ends of the filter element sealingly engage the interior walls of the housing while the filter element is spaced radially inwardly from the housing thus forming an annular inlet chamber. Fluid flows from the inlet and into the annular chamber, through the filter element and to the reservoir through the open lower end of the filter element. An elongated tube is disposed within the interior of the filter element and has one end open to the bottom of the extension tube and its other end open adjacent the lower open end of the filter element.

US Patent:

42683840, May 19, 1981

Filed:

Mar 21, 1977

Appl. No.:

5/779329

Inventors:

Borje O. Rosaen - Ann Arbor MI
Dale P. Fosdick - Ann Arbor MI

International Classification:

B01D 3514

US Classification:

210133

Abstract:

A head assembly for a spin-off filter is provided and comprises a stamped housing having a closed top wall and an open bottom with a flange adapted to sealingly engage the spin-off filter. A tube extends through the housing and is secured to the housing by appropriate means, such as welding. A member is thereafter secured to the tube for detachable connection with the spin-off filter. The tube also includes fluid passage means formed therein so that one end of the tube forms a fluid outlet while the other end of the tube forms a fluid inlet for connection with a fluid system. Fluid flow into the fluid inlet is diverted by the fluid passage means through the spin-off filter and to the fluid outlet.

US Patent:

41972074, Apr 8, 1980

Filed:

Nov 22, 1978

Appl. No.:

5/963034

Inventors:

Borje O. Rosaen - Ann Arbor MI
Dale P. Fosdick - Ann Arbor MI

International Classification:

B01D 3502

US Classification:

210447

Abstract:

A fluid filtering device is provided for connection with a fluid line. The fluid device includes a housing having a fluid inlet on one end, a fluid outlet on the other end and a fluid passage formed through the housing. The fluid passage connects the inlet with the outlet and includes a port formed along its length. A tubular filter element open at one end is removably insertable into a filter chamber formed within the housing and, upon insertion, is axially slidable between a first position in which the open end of the filter element abuts against the fluid port and a second position in which the open end of the filter element is spaced from the fluid port. A spring urges the filter element toward its first position. In operation the fluid flow into the housing inlet passes through the port and into the interior of the filter element. The fluid then flows through the filter element and to the housing outlet.

US Patent:

42657610, May 5, 1981

Filed:

Sep 17, 1979

Appl. No.:

6/076393

Inventors:

Borje O. Rosaen - Ann Arbor MI
Dale P. Fosdick - Ann Arbor MI

International Classification:

B01D 3502

US Classification:

210315

Abstract:

A fluid filtering device is provided for connection with a fluid line. The fluid device includes a housing having a fluid inlet on one end, a fluid outlet on the other end and a fluid passage formed through the housing. The fluid passage connects the inlet with the outlet and includes a port formed along its length. A tubular filter element open at one end is removably insertable into a filter chamber formed within the housing and, upon insertion, is axially slidable between a first position in which the open end of the filter element abuts against the fluid port and a second position in which the open end of the filter element is spaced from the fluid port. A spring urges the filter element toward its first position. In operation the fluid flow into the housing inlet passes through the port and into the interior of the filter element. The fluid then flows through the filter element and to the housing outlet.

US Patent:

42157188, Aug 5, 1980

Filed:

Nov 22, 1978

Appl. No.:

5/963035

Inventors:

Borje O. Rosaen - Ann Arbor MI
Dale P. Fosdick - Ann Arbor MI

International Classification:

F16K 1502

US Classification:

13754319

Abstract:

A novel relief valve is provided for connection with a fluid system. The relief valve includes an elongated housing having an inlet and an outlet with a fluid passage connecting the inlet to the outlet. Preferably, the housing is constructed of a number of conventional and readily available pipe fittings. A relief valve assembly is disposed within the fluid passageway and comprises a perforated tube with a valve seat positioned at one axial end of the tube and adjacent the housing inlet. A valve member is also disposed within the perforated tube and is urged against the valve seat by a helical spring to normally prevent fluid flow through the relief valve. A stop pin is disposed through substantially diametrically opposed apertures in the perforated tube at a position spaced from the valve seat which acts as a stop for the end of the helical spring opposite from the valve member. The axial length, and thus the compression, of the spring can be varied by changing the axial position of the stop pin which accordingly varies the fluid pressure at the housing inlet necessary to open the valve assembly and to permit fluid flow through the relief valve.