Patent FR656146A successfully refreshed from Google Patents.
Patent US3139745A successfully refreshed from Google Patents.
US3139745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas chromatographic unit
Assignee: Eastman Kodak Co
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Filing: 1960-12-08
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Granted: 1964-07-07
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Expires: 1980-12-08
Abstract
No abstract record available.
Inventors
- 👤 Douglas C Sievers
- 👤 Jr John N Roper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:57
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/30; G01N2030/3053; G01N2030/3084
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
100 words
GAS CHROMATOGRAPHIC APPARATUS COMPRISING A CYLINWALLS HINGED TOGETHER ALONG THE LOCUS OF ONE END OF A DIAMETER OF SAID CYLINDRICAL RADIANT HEATING UNIT WITH CIRCUMFERENTIALLY PLACED HEATING RODS WRAPPED WITH COILED WIRE CONNECTING COLLAR PORTIONS POSITIONED INSIDE SAID UNIT AT EACH END OF SAID HEMICYLINDRICAL WALLS, SAID WALLS BEING HEAT REFLECTIVE ON THE INSIDE, SPIRAL-SHAPED CARRIER GAS CONDUCTING MEANS CENTRALLY POSITIONED WITHIN SAID HEATING UNIT, A CARRIER GAS CONDUCTING MEANS, SAID HEATING UNIT CONNECTED AT ONE EXTREMITY THEREOF TO GAS CHROMATOGRAPHIC DETECTING MEANS, AND MEANS FOR INJECTING SAMPLE AND CARRIER GAS INTO SAID GAS CONDUCTING MEANS INSIDE SAID HEATING UNIT.
References Cited (Backward Citations)
US2379820A
Cited
US2450563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |