US3630006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spiral capillary gas chromatographic column
Assignee: Individual
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Filing: 1969-11-05
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Granted: 1971-12-28
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Expires: 1989-11-05
Abstract
Abstract A capillary column for a gas chromatograph is presented by mutually cooperable surface portions of the complemental faces of a pair of separable members. At least one of the members has a pair of side-by-side grooves in the surface thereof whereby when the faces are disposed in interengagement the surface portions present a pair of groove capillary passages. One of the grooves serves as a separation groove while the other groove accommodates a reference standard. Inlet and outlet openings through one of the members communicate with opposite ends of the capillary passage and provides means for coupling the column with the inlet and outlet of a gas chromatograph. The reference groove provides a check for determining if any sample leaks from the separation groove and also greatly reduces the amount of leakage by equalizing the pressure on the separation groove. The members are easily disengaged to permit recoating of the partitioning material onto the grooved surface and can be quickly reassembled to present a fresh column.
Inventors
- 👤 Antonio A Sandoval
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:26
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/60; G01N30/6095
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
A capillary column adapted to be coupled between the inlet and outlet openings of a material-analyzing chromatograph, said column comprising: a pair of separable members provided with opposed, essentially complemental faces, said faces being provided with opposed, mutually cooperable surface portions defining first and second side-by-side, continuous, coextending, nonlinear capillary passages therebetween, said first passage presenting a separation groove of a length sufficient to permit effective separation therewithin of certain of the constituents of said material to an extent adequate to permit analysis thereof, said first passage being provided with inlet-presenting means for communicating the separation groove with the inlet of the chromatograph and outlet-presenting means for communicating the separation groove with the outlet of the chromatograph, said second passage presenting a sample clearance groove for receiving an inert gas during separation of said constituents in the separation groove, said second passage being provided with inlet-presenting means and outlet-presenting means, and said faces being disposed in sufficiently tight complemental interengagement to substantially preclude flow of said material being analyzed from said separation groove into said clearance groove.
Claim 2
Dependent Claim
177 words
A capillary column adapted to be coupled between the inlet and outlet openings of a material-analyzing chromatograph, said column comprising: a pair of separable members provided with opposed, essentially complemental faces, said faces being provided with opposed, mutually cooperable surface portions defining first and second side-by-side, continuous, coextending, nonlinear capillary passages therebetween, said first passage presenting a separation groove of a length sufficient to permit effective separation therewithin of certain of the constituents of said material to an extent adequate to permit analysis thereof, said first passage being provided with inlet-presenting means for communicating the separation groove with the inlet of the chromatograph and outlet-presenting means for communicating the separation groove with the outlet of the chromatograph, said second passage presenting a sample clearance groove for receiving an inert gas during separation of said constituents in the separation groove, said second passage being provided with inlet-presenting means and outlet-presenting means, and said faces being disposed in sufficiently tight complemental interengagement to substantially preclude flow of said material being analyzed from said separation groove into said clearance groove.
Claim 3
Dependent Claim
51 words
A capillary column as set forth in claim 1, wherein said separation groove and said sample clearance groove are each presented by a recessed portion of one of said members, the other of said members having a continuous uninterrupted surface in opposed relationship to said recessed portion for closing said grooves.
Claim 4
Dependent Claim
69 words
A capillary column as set forth in claim 1, wherein each of said passages follows a spiral path around the face of said one member with said passages in closely spaced relationship and with said sample clearance groove having its outermost convolution spaced outwardly from the outermost convolution of said separation groove whereby the latter is bounded on opposite sides through out its length by said sample clearance groove.
Claim 5
Dependent Claim
61 words
A capillaRy column as set forth in claim 1, wherein said members are planar, at least one of the surface portions having a groove therein whereby when said faces are disposed in interengagement said surface portions present said capillary passage; and a plurality of fastening means disposed in surrounding relationship to said passage for bringing said faces into tight complemental interengagement.
Claim 6
Dependent Claim
55 words
A capillary column as set forth in claim 1, wherein said members comprise a pair of generally cylindrical bodies disposed one within the other in a tight interference fit, at least one of said surface portions having a groove therein whereby when said faces are disposed in interengagement said surface portions present said capillary passage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |