US4737148A — Filtered T coupling

Claim 1

Independent Claim 285 words

A fluid T-coupling system, comprising: a filtered fluid T-coupling, comprised of; a substantially linear through fluid flow path having an outlet channel and an inlet channel, a substantially linear vent path having an inflow channel and an outflow channel, said outflow channel intersecting and communicating with said through fluid flow channel, a filter, at least a portion of which is sealed within said T-coupling, wherein said portion of said filter sealed within said T-coupling is positioned between said inflow and outflow channels in such a manner that all fluid flowing from said inflow channel to said outflow channel passes through said portion of said filter, a sealing surface circumventing said inflow channel, and two peripheral tabs connected to said vent path in a plane essentially perpendicular to said inflow channel; and a receptacle to which said T-coupling is selectably lockable, comprised of; a vent channel having an inlet and an outlet, said inlet communicating with an air supply, a sealing surface circumventing said vent channel outlet designed to mate with said sealing surface of said T-coupling, and a peripheral overhanging flange of generally L-shaped cross-section connected to said vent channel outlet, the overhanging portion of said flange including notches through which said tabs can be inserted in a direction essentially parallel to said vent path of said T-coupling, said overhanging flange having a height greater than the height of said tabs, thereby permitting said tabs after said insertion to be rotated about the longitudinal axis of said vent path to lock said tabs beneath said overhanging flange and causing said mating sealing surfaces to form an airtight seal between one another while permitting the communication of said receptacle vent outlet with said T-coupling inflow channel.

Claim 2

Dependent Claim 285 words

A fluid T-coupling system, comprising: a filtered fluid T-coupling, comprised of; a substantially linear through fluid flow path having an outlet channel and an inlet channel, a substantially linear vent path having an inflow channel and an outflow channel, said outflow channel intersecting and communicating with said through fluid flow channel, a filter, at least a portion of which is sealed within said T-coupling, wherein said portion of said filter sealed within said T-coupling is positioned between said inflow and outflow channels in such a manner that all fluid flowing from said inflow channel to said outflow channel passes through said portion of said filter, a sealing surface circumventing said inflow channel, and two peripheral tabs connected to said vent path in a plane essentially perpendicular to said inflow channel; and a receptacle to which said T-coupling is selectably lockable, comprised of; a vent channel having an inlet and an outlet, said inlet communicating with an air supply, a sealing surface circumventing said vent channel outlet designed to mate with said sealing surface of said T-coupling, and a peripheral overhanging flange of generally L-shaped cross-section connected to said vent channel outlet, the overhanging portion of said flange including notches through which said tabs can be inserted in a direction essentially parallel to said vent path of said T-coupling, said overhanging flange having a height greater than the height of said tabs, thereby permitting said tabs after said insertion to be rotated about the longitudinal axis of said vent path to lock said tabs beneath said overhanging flange and causing said mating sealing surfaces to form an airtight seal between one another while permitting the communication of said receptacle vent outlet with said T-coupling inflow channel.

Claim 3

Dependent Claim 35 words

The fluid T-coupling system of claim 1 wherein one of said tabs has a shape which allows it to be inserted through only one of said notches in a direction parallel to said vent path.

Claim 4

Dependent Claim 34 words

The fluid T-coupling system of claim 1 further comprising a handle extending opposite said filter from said intersection of said flow path and said vent path to facilitate the rotation of said fluid T-coupling.

Claim 5

Dependent Claim 33 words

The fluid T-coupling system of claim 2 further comprising a pin secured between said overhanging flange and said receptacle thereby limiting the range of potential axial rotation of said T-coupling within said receptacle.

Claim 6

Dependent Claim 19 words

The fluid T-coupling system of claim 1 wherein said tabs are tapered to facilitate their rotation within said receptacle.

Claim 7

Dependent Claim 202 words

A filtered T-coupling selectably lockable with a receptacle, said receptacle forming a fluid flow channel and having a generally L-shaped overhanging flange, the overhanging portion of which has two notches formed therein, comprising: a first through fluid flow channel; a second substantially linear fluid flow channel intersecting said first channel, said second channel intersected by a cavity distal said intersection of said first and second channels; a filter at least a portion of which is sealed within said T-coupling, wherein said portion of said filter sealed within said T-coupling is positioned within said cavity so as to completely permeably block said second channel; and two tabs extending outward from said second channel in a plane essentially perpendicular to said second channel less than the distance said flange of said receptacle overhangs, so as to be insertable through said notches in a direction essentially parallel to said second channel, said tabs having a thickness which permits said tabs, after said insertion through said notches, to be rotated about the axis of said second channel to lock said tabs beneath said overhanging flange of said receptacle, thereby permitting the communication of fluid between said receptacle fluid flow channel and said second fluid flow channel.

Claim 8

Dependent Claim 202 words

A filtered T-coupling selectably lockable with a receptacle, said receptacle forming a fluid flow channel and having a generally L-shaped overhanging flange, the overhanging portion of which has two notches formed therein, comprising: a first through fluid flow channel; a second substantially linear fluid flow channel intersecting said first channel, said second channel intersected by a cavity distal said intersection of said first and second channels; a filter at least a portion of which is sealed within said T-coupling, wherein said portion of said filter sealed within said T-coupling is positioned within said cavity so as to completely permeably block said second channel; and two tabs extending outward from said second channel in a plane essentially perpendicular to said second channel less than the distance said flange of said receptacle overhangs, so as to be insertable through said notches in a direction essentially parallel to said second channel, said tabs having a thickness which permits said tabs, after said insertion through said notches, to be rotated about the axis of said second channel to lock said tabs beneath said overhanging flange of said receptacle, thereby permitting the communication of fluid between said receptacle fluid flow channel and said second fluid flow channel.

Claim 9

Dependent Claim 29 words

The filtered T-coupling of claim 6 further comprising a resilient sealing surface circumventing said second channel designed to form a seal with a mating sealing surface on said receptacle.

Claim 10

Dependent Claim 16 words

The filtered T-coupling of claim 6 wherein the two tabs essentially comprise segments of an arc.

Claim 11

Dependent Claim 42 words

The filtered T-coupling of claim 6 wherein the larger of said two tabs is not insertable in a direction parallel to said second channel through one of said notches, thus further ensuring the correct orientation of the fluid T-coupling within the receptacle.

Claim 12

Dependent Claim 24 words

The filtered T-coupling of claim 6 wherein the tabs are tapered in the direction in which they are properly to be rotated upon insertion.

Claim 13

Dependent Claim 61 words

The filtered T-coupling of claim 6 further comprising an essentially planar handle extending opposite said filter from said intersection of said first and second channels, said handle oriented so that the line of the axis of said second channel is contained within the plane of said handle, thereby facilitating the rotation of the T-coupling about the axis of said second channel.

Claim 14

Dependent Claim 24 words

The filtered T-coupling of claim 6 wherein said surfaces defining said cavity have ribs to aid in fixedly securing said filter within said cavity.

Claim 15

Dependent Claim 29 words

The filtered T-coupling of claim 6, wherein the ends of said first channel have truncated cone-shaped nipples to ensure a fluid-tight seal between a connecting tube and said coupling.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-04-12	1991-10-12	1992-04-12	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-04-12	1995-10-12	1996-04-12	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-04-12	1999-10-12	2000-04-12	$7700.00	Window Closed / Lapsed

Filtered T coupling

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