US3174829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for kjeldahl nitrogen determination
Assignee: Individual
•
Filing: 1961-08-25
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Granted: 1965-03-23
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Expires: 1981-08-25
Abstract
No abstract record available.
Inventors
- 👤 Evan L R Stokstad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:37
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
APPARATUS FOR CONDUCTING KJELDAHL NITROGEN DETERMINATIONS WHICH COMPRISES A DIGESTION CHAMBER, A DISTILLATION CHAMBER AND A CONDENSER, SAID ELEMENTS BEING JOINED WITH A PASSAGEWAY FOR VAPORS, SAID DISTILLATION CHAMBER HAVING AT ITS LOWER END MEANS TO OPEN AND CLOSE THE PASSAGEWAY FROM THE DIGESTION CHAMBER TO THE DISTILLATION CHAMBER AT DESIRED INTERVALS OF TIME, A PURGE TUBE TO INTRODUCE AN AIR STREAM INTO THE DIGESTION CHAMBER AND AN EXIT TUBE TO REMOVE VAPORS FROM SAID DIGESTION CHAMBER, A CAPILLARY TUBE IN SAID PURGE TUBE TO PERMIT FLOW OF A SMALL VOLUME OF AIR THROUGH SAID PURGE TUBE DURING OPERATION OF THE APPARATUS, A TUBE PERMITTING INTRODUCTION OF WATER INTO SAID DIGESTION CHAMBER, MEANS IN THE UPPER SECTION OF SAID DISTILLATION CHAMBER TO INTRODUCE AIR INTO SAID CHAMBER, A TUBE FOR THE INTRODUCTION OF LIQUID INTO THE UPPER PORTION OF SAID DISTILLATON CHAMBER, AND A VALVE IN SAID PASSAGE LEADING FROM THE CONDENSER CONTROLLING THE FLOW OF FLUIDS THROUGH SAID CONDENSER.
Claim 2
Dependent Claim
160 words
APPARATUS FOR CONDUCTING KJELDAHL NITROGEN DETERMINATIONS WHICH COMPRISES A DIGESTION CHAMBER, A DISTILLATION CHAMBER AND A CONDENSER, SAID ELEMENTS BEING JOINED WITH A PASSAGEWAY FOR VAPORS, SAID DISTILLATION CHAMBER HAVING AT ITS LOWER END MEANS TO OPEN AND CLOSE THE PASSAGEWAY FROM THE DIGESTION CHAMBER TO THE DISTILLATION CHAMBER AT DESIRED INTERVALS OF TIME, A PURGE TUBE TO INTRODUCE AN AIR STREAM INTO THE DIGESTION CHAMBER AND AN EXIT TUBE TO REMOVE VAPORS FROM SAID DIGESTION CHAMBER, A CAPILLARY TUBE IN SAID PURGE TUBE TO PERMIT FLOW OF A SMALL VOLUME OF AIR THROUGH SAID PURGE TUBE DURING OPERATION OF THE APPARATUS, A TUBE PERMITTING INTRODUCTION OF WATER INTO SAID DIGESTION CHAMBER, MEANS IN THE UPPER SECTION OF SAID DISTILLATION CHAMBER TO INTRODUCE AIR INTO SAID CHAMBER, A TUBE FOR THE INTRODUCTION OF LIQUID INTO THE UPPER PORTION OF SAID DISTILLATON CHAMBER, AND A VALVE IN SAID PASSAGE LEADING FROM THE CONDENSER CONTROLLING THE FLOW OF FLUIDS THROUGH SAID CONDENSER.
References Cited (Backward Citations)
US2812242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |