US3143404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas chromatography columns
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1960-09-30
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Granted: 1964-08-04
•
Expires: 1980-09-30
Abstract
No abstract record available.
Inventors
- 👤 John J Heigl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:27
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/60; G01N30/6034; G01N30/26; G01N30/28; G01N30/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A GAS CHROMATOGRAPHY COLUMN COMPRISING A SERIES OF THIN, METAL-RIBBONED TUBES CONCENTRICALLY ARRANGED AND SPACED UNIFORMLY WITHIN EACH OTHER, EACH TUBE DEFINING BY CRIMPED WALL PORTIONS THEREOF A PLURALITY OF CAPILLARIES LENGTHWISE OF SAID TUBE HAVING A CROSS-SECTIONAL AREA BETWEEN .00000625 AND 0004 SQUARE INCH, SAID CAPILLARIES HAVING AN ORGANIC AGENT SUITABLE FOR USE IN GAS CHROMATOGRAPHY AS A THIN FILM ON THE CAPILLARY WALLS, A HOLLOWTUBULAR CENTER CORE LOCATED CONCENTRICALLY WITHIN SAID CAPILLARY TUBES, ALTERNATE ONES OF SAID CAPILLARY TUBES EXTENDING LENGTHWISE BEYOND THE END OF AN INTERMEDIATE TUBE TO PROVIDE COMMUNICATION BETWEEN THE SPACES BETWEEN ADJACENT TUBES AND CONTINUOUS COMMUNICATION BETWEEN EACH OF SAID TUBES, RADIAL ANNULAR SEALING MEMERS CONNECTING THE ENDS OF SAID ALTERNATE CAPILLARY TUBES, THE OUTERMOST AND INNERMOST PAIRS OF TUBES DEFINING OPENINGS FOR THE PASSAGE OF GAS LONGITUDINALLY THROUGH SAID SERIES OF TUBES.
Claim 2
Dependent Claim
139 words
A GAS CHROMATOGRAPHY COLUMN COMPRISING A SERIES OF THIN, METAL-RIBBONED TUBES CONCENTRICALLY ARRANGED AND SPACED UNIFORMLY WITHIN EACH OTHER, EACH TUBE DEFINING BY CRIMPED WALL PORTIONS THEREOF A PLURALITY OF CAPILLARIES LENGTHWISE OF SAID TUBE HAVING A CROSS-SECTIONAL AREA BETWEEN .00000625 AND 0004 SQUARE INCH, SAID CAPILLARIES HAVING AN ORGANIC AGENT SUITABLE FOR USE IN GAS CHROMATOGRAPHY AS A THIN FILM ON THE CAPILLARY WALLS, A HOLLOWTUBULAR CENTER CORE LOCATED CONCENTRICALLY WITHIN SAID CAPILLARY TUBES, ALTERNATE ONES OF SAID CAPILLARY TUBES EXTENDING LENGTHWISE BEYOND THE END OF AN INTERMEDIATE TUBE TO PROVIDE COMMUNICATION BETWEEN THE SPACES BETWEEN ADJACENT TUBES AND CONTINUOUS COMMUNICATION BETWEEN EACH OF SAID TUBES, RADIAL ANNULAR SEALING MEMERS CONNECTING THE ENDS OF SAID ALTERNATE CAPILLARY TUBES, THE OUTERMOST AND INNERMOST PAIRS OF TUBES DEFINING OPENINGS FOR THE PASSAGE OF GAS LONGITUDINALLY THROUGH SAID SERIES OF TUBES.
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |