US3780984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for fluid handling and sampling
Assignee: EIDP Inc
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Filing: 1971-03-04
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Granted: 1973-12-25
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Expires: 1991-03-04
Abstract
Abstract An apparatus and a method for handling and sampling fluids which comprises principally a nonpumping valve designed so that in operation it moves less than a microliter of fluid, and a pumping valve designed to aspirate a precisely determined amount of fluid into the body of the valve with no more motion than is inherent in the operation of the valve itself and with no change in the physical dimensions of the valve. These valves, when used in combination with a transfer probe and a pump designed to handle minute quantities of fluid, form a precision fluid handling and sampling system which will not contaminate or dilute the fluid to be sampled.
Inventors
- 👤 W Ambrose
- 👤 J Mcerlane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:44
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/10; G01N1/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
266 words
A nonpumping valve assembly comprising: an enclosed cylindrical valve chamber having two opposed ends separated by a tubular side wall, said valve chamber having at least one connecting orifice in one of its ends, a second orifice in its other end and at least one orifice for admitting a first fluid into said valve chamber; a cylindrical channel having two opposed ends separated by tubular side walls, said channel being connected to said valve chamber, at one of its ends, through said connecting orifice and having third and fourth orifices in its side walls to provide a throughput passage through said channel for a second fluid; a valve seat associated with said connecting orifice; an essentially cylindrical movable closing means disposed within said valve chamber and adapted to cooperate with said valve seat to close off said connecting orifice without obstructing the remaining orifices in said valve chamber; a movable support means comprising two cylindrical support rods of substantially equal diameter connected to said closing means for moving said closing means into and out of contact with said valve seat, said closing means and said cylindrical support rods being disposed concentrically within said valve chamber so that one of said support rods extends through one of said connecting orifices and the other of said support rods extends through said second orifice, and being constructed so that when said closing means is in contact with said valve seat, the volume within said valve chamber occupied by said closing means and said support means, and therefore unavailable to fluid, remains substantially constant when said closing means is moved.
Claim 2
Dependent Claim
266 words
A nonpumping valve assembly comprising: an enclosed cylindrical valve chamber having two opposed ends separated by a tubular side wall, said valve chamber having at least one connecting orifice in one of its ends, a second orifice in its other end and at least one orifice for admitting a first fluid into said valve chamber; a cylindrical channel having two opposed ends separated by tubular side walls, said channel being connected to said valve chamber, at one of its ends, through said connecting orifice and having third and fourth orifices in its side walls to provide a throughput passage through said channel for a second fluid; a valve seat associated with said connecting orifice; an essentially cylindrical movable closing means disposed within said valve chamber and adapted to cooperate with said valve seat to close off said connecting orifice without obstructing the remaining orifices in said valve chamber; a movable support means comprising two cylindrical support rods of substantially equal diameter connected to said closing means for moving said closing means into and out of contact with said valve seat, said closing means and said cylindrical support rods being disposed concentrically within said valve chamber so that one of said support rods extends through one of said connecting orifices and the other of said support rods extends through said second orifice, and being constructed so that when said closing means is in contact with said valve seat, the volume within said valve chamber occupied by said closing means and said support means, and therefore unavailable to fluid, remains substantially constant when said closing means is moved.
Claim 3
Dependent Claim
44 words
The valve of claim 1 wherein said support rods are constructed in a manner such that the volume within said valve chamber occupied by said closing means and said support rods changes by no more than one microliter when said closing means is moved.
Claim 4
Dependent Claim
33 words
The valve of claim 2 wherein the orifice associated with said valve seat is connected to a source of second fluid which can be added to said first fluid by opening said valve.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |