Patent US4726822A successfully refreshed from Google Patents.
US4726822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast response thermochromatographic capillary columns
Assignee: Technical Products Group Inc
•
Filing: 1984-10-22
•
Granted: 1988-02-23
•
Expires: 2004-10-22
Abstract
Abstract A thermochromatographic column has a fused silica capillary with a high temperature chemically inert polymer coating thereon supporting a thin heater film formed by the deposition of either a high resistance metallic compound auto-catalytically from a solution of the compound or a nichrome film sputtered onto the polymer clad capillary tubing. The electrical contacts to the heater film may be either resistance welded thereto or the electrically conductive wires may be attached to the capillary body and integrated into the heater film during the deposition of the heater film. An outer layer of an electrically insulating material is applied to the heater film to electrically isolate the heater film and to protect the heater film from damage.
Inventors
- 👤 Marion H. Cates
- 👤 William E. Skillman, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:23
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/30; G01N30/60; G01N30/6052; G01N30/6073; G01N30/6078; G01N2030/3053; G01N2030/3061
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
58 words
A chromatographic column comprising capillary means having an outer surface and heater means including a resistive material in the form of a uniform homogeneous film deposited as a continuous enveloping layer completely covering said outer surface of said capillary means wherein said resistive film includes a sputtered film of nichrome deposited on said surface of said capillary means.
Claim 2
Dependent Claim
58 words
A chromatographic column comprising capillary means having an outer surface and heater means including a resistive material in the form of a uniform homogeneous film deposited as a continuous enveloping layer completely covering said outer surface of said capillary means wherein said resistive film includes a sputtered film of nichrome deposited on said surface of said capillary means.
Claim 3
Dependent Claim
25 words
A chromatographic column as set forth in claim 1 wherein said resistive film includes electrical terminal means connected to respective ends of said resistive film.
Claim 4
Dependent Claim
29 words
A chromatographic column as set forth in claim 2 wherein said terminal means include electrically conductive bands encircling and in contact with said respective ends of said resistive film.
Claim 5
Dependent Claim
33 words
A chromatographic column as set forth in claim 1 wherein said capillary means includes a fused silica tube having an outer layer of a high temperature chemically inert polymer forming said outer surface.
Claim 6
Dependent Claim
28 words
A chromatographic column as set forth in claim 4 wherein said heater means includes an outer layer of a high temperature, chemically inert polymer on said resistive film.
Claim 7
Dependent Claim
57 words
A chromatographic column comprising capillary means having an outer surface and heater means including a resistive material in the form of a uniform homogeneous film deposited as a continuous enveloping layer completely covering said outer surface of said capillary means wherein said resistive film includes a nickel phosphide layer deposited on said outside surface of said capillary.
Claim 8
Dependent Claim
57 words
A chromatographic column comprising capillary means having an outer surface and heater means including a resistive material in the form of a uniform homogeneous film deposited as a continuous enveloping layer completely covering said outer surface of said capillary means wherein said resistive film includes a nickel phosphide layer deposited on said outside surface of said capillary.
Claim 9
Dependent Claim
24 words
A chromatographic column as set in claim 6 wherein said resistive film includes electrical terminal means connected to respective ends of said heater means.
Claim 10
Dependent Claim
28 words
A chromatographic column as set forth in claim 7 wherein said terminal means include electrically conductive bands encircling and in contact with respective ends of said resistive film.
Claim 11
Dependent Claim
33 words
A chromatographic column as set forth in claim 6 wherein said capillary means includes a fused silica tube having an outer layer of a high temperature, chemically inert polymer forming said outer surface.
Claim 12
Dependent Claim
102 words
A chromatographic column comprising capillary means having an outer surface and heater means including a resistive material in the form of a uniform homogeneous film deposited as a continuous enveloping layer completely covering said outer surface of said capillary means wherein said capillary means includes a fused silica tube having an outer layer of a high temperature chemically inert polymer forming said surface and wherein said heater means includes an outer layer of a high temperature, chemically inert polymer on said resistive film and wherein said resistive film includes a nickel phosphide layer deposited on said outer layer on said capillary means.
Claim 13
Dependent Claim
102 words
A chromatographic column comprising capillary means having an outer surface and heater means including a resistive material in the form of a uniform homogeneous film deposited as a continuous enveloping layer completely covering said outer surface of said capillary means wherein said capillary means includes a fused silica tube having an outer layer of a high temperature chemically inert polymer forming said surface and wherein said heater means includes an outer layer of a high temperature, chemically inert polymer on said resistive film and wherein said resistive film includes a nickel phosphide layer deposited on said outer layer on said capillary means.
Claim 14
Dependent Claim
25 words
A chromatographic column as set forth in claim 10 wherein said heater means includes electrical terminal means connected to respective ends of said resistive film.
Claim 15
Dependent Claim
104 words
A chromatographic column comprising capillary means having an outer surface and heater means including a resistive material in the form of a uniform homogeneous film deposited as a continuous enveloping layer completely covering said outer surface of said capillary means wherein said capillary means includes a fused silica tube having an outer layer of a high temperature chemically inert polymer forming said outer surface and wherein said heater means includes an outer layer of a high temperature, chemically inert polymer on said resistive film and wherein said resistive film includes a sputtered film of nichrome deposited on said outer layer on said capillary means.
Claim 16
Dependent Claim
104 words
A chromatographic column comprising capillary means having an outer surface and heater means including a resistive material in the form of a uniform homogeneous film deposited as a continuous enveloping layer completely covering said outer surface of said capillary means wherein said capillary means includes a fused silica tube having an outer layer of a high temperature chemically inert polymer forming said outer surface and wherein said heater means includes an outer layer of a high temperature, chemically inert polymer on said resistive film and wherein said resistive film includes a sputtered film of nichrome deposited on said outer layer on said capillary means.
Claim 17
Dependent Claim
25 words
A chromatographic column as set forth in claim 12 wherein said resistive film includes electrical terminal means connected to respective ends of said heater means.
References Cited (Backward Citations)
US2886470A
Cited
US2915613A
Cited
US2977450A
Cited
US3063286A
Cited
US3496336A
Cited
US3856681A
Cited
US4156127A
Cited
US4194536A
Cited
US4293415A
Cited
US4280905A
Cited
US4321073A
Cited
US4418984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |