US3271930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pre-treatment of carriers for use in gas/liquid distributing chromatography
Assignee: Knapsack AG
•
Filing: 1964-10-14
•
Granted: 1966-09-13
•
Expires: 1984-10-14
Abstract
No abstract record available.
Inventors
- 👤 Ewald Gert
- 👤 Zech Horst
- 👤 Esser Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:15
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/50; G01N30/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A GAS CHROMATOGRAPHICAL PROCESS FOR ANALYZING GASEOUS MIXTURES COMPRISING THE STEPS OF INTIMATELY MIXING A CHROMATOGRAPHIC CARRIER SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF KIESELGUHR, ALUMINUM OXIDE, SILICATES AND SPECIAL PREPARATIONS THEREOF WITH ABOUT 1-20% BY WEIGHT OF SAID CARRIER SUBSTANCE OF ORTHOPHOPHORIC ACID, HEATING THE RESULTING MIXTURE FOR A PERIOD OF ABOUT 0.5 CONTACTING SAID ACID TREATED CARRIER SUBSTANCE WITH A SEPARATING LIQUID, AND PASSING OVER SAID CARRIER SUBSTANCE CONTACTED WITH SAID SEPARATING LIQUID SAID GASEOUS MIXTURES TO BE ANALYZED.
Claim 2
Dependent Claim
81 words
A GAS CHROMATOGRAPHICAL PROCESS FOR ANALYZING GASEOUS MIXTURES COMPRISING THE STEPS OF INTIMATELY MIXING A CHROMATOGRAPHIC CARRIER SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF KIESELGUHR, ALUMINUM OXIDE, SILICATES AND SPECIAL PREPARATIONS THEREOF WITH ABOUT 1-20% BY WEIGHT OF SAID CARRIER SUBSTANCE OF ORTHOPHOPHORIC ACID, HEATING THE RESULTING MIXTURE FOR A PERIOD OF ABOUT 0.5 CONTACTING SAID ACID TREATED CARRIER SUBSTANCE WITH A SEPARATING LIQUID, AND PASSING OVER SAID CARRIER SUBSTANCE CONTACTED WITH SAID SEPARATING LIQUID SAID GASEOUS MIXTURES TO BE ANALYZED.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |