Fluid handling – With liquid valves or liquid trap seals – Liquid seal in liquid flow line; flow liquid forms seal
Reexamination Certificate
2005-12-13
2005-12-13
Rivell, John (Department: 3753)
Fluid handling
With liquid valves or liquid trap seals
Liquid seal in liquid flow line; flow liquid forms seal
C137S251100, C137S493900
Reexamination Certificate
active
06973938
ABSTRACT:
A pressure and vacuum vent utilizing a column of liquid to open and close the vent at predetermined pressure and vacuum levels. A column of liquid is constrained in connection with internal and external passages coupled between a pair of expansion chambers. The external passage is sized to hold a level of liquid corresponding to a predetermined positive pressure level at which the valve will open, while the internal passage is sized to hold a level of liquid corresponding to a predetermined negative pressure level at which the valve will open. At either the predetermined positive or negative pressure level, the valve opens when sufficient liquid has exited either the external or internal passage to permit the flow of a restrained gas past the liquid column.
REFERENCES:
patent: 90226 (1869-05-01), Boden
patent: 165119 (1875-06-01), Prosser
patent: 169805 (1875-11-01), Harrison
patent: 1068904 (1913-07-01), Ionides, Jr.
patent: 1102549 (1914-07-01), Rumpf
patent: 1243604 (1917-10-01), Honeywell
patent: 1460900 (1923-07-01), Harris et al.
patent: 1520583 (1924-12-01), Lockhart
patent: 1595668 (1926-08-01), Kuhl
patent: 1637489 (1927-08-01), Kuhl
patent: 1651051 (1927-11-01), Wiggins
patent: 1858505 (1932-05-01), Jacobi
patent: 2029955 (1936-02-01), Taylor
patent: 2070204 (1937-02-01), Hetzer
patent: 2086969 (1937-07-01), Strelow
patent: 2152422 (1939-03-01), Tokheim
patent: 2168891 (1939-08-01), Wiggins et al.
patent: 2280390 (1942-04-01), Ensign
patent: 2405704 (1946-08-01), Matuszak
patent: 2416855 (1947-03-01), St. Clair
patent: 2575574 (1951-11-01), Withrow et al.
patent: 2704088 (1955-03-01), Nerem
patent: 2735366 (1956-02-01), Hunter
patent: 2839923 (1958-06-01), Whitworth
patent: 2971531 (1961-02-01), Jurs et al.
patent: 3180710 (1965-04-01), Brown et al.
patent: 3386468 (1968-06-01), Dickinson et al.
patent: 3592224 (1971-07-01), Bois
patent: 3826277 (1974-07-01), Bois
patent: 4131129 (1978-12-01), Firestone
patent: 4616763 (1986-10-01), Ruhl
patent: 4716922 (1988-01-01), Camp
patent: 5054511 (1991-10-01), Tuan et al.
patent: 5419366 (1995-05-01), Johnston
patent: 5957157 (1999-09-01), Mitchell et al.
Morrison Bros. Co. “A Natural Combination” advertisement introducing the first AST pressure/vacuum vent.
OPW Fueling Components Jan. 1996 “Instruction Brochure” for the OPW 523 Series 3″ W.C. Pressure/8″ W.C. Vaccum Pressure/Vacuum Vent.
Petroleum Equipment Manufacturing Company, Inc. Catalogue pp. 21, 36-37.
Morrison Bros. Co. “Product Brochure” 1997.
EBW “Sales Bulletin” Apr. 20, 1998 “New Product Announcement—CARB Certified Pressure Vacuum Vents”.
Morrison Bros Co. advertisement in the Aug. 1998 issue of “Petroleum Equipment & Technology” p. 31, “Pressure/Vacuum Vent with built-in overfill alarm.”.
OPW Fueling Components advertisement in the Aug. 1998 issue of “Petroleum Equipment & Technology” Journal “Doing It Right; Abovegrougn Storage Tank Products; Top Off Your Tank With OPW AST Products.”.
Denk Paul M.
Husky Corporation
Rivell John
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