US3964869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analytical apparatus for serial determination of nitrogen in samples by the Kjeldahl method
Assignee: NK Verwaltungs AG
•
Filing: 1975-07-11
•
Granted: 1976-06-22
•
Expires: 1995-07-11
Abstract
Abstract This invention provides for an analytical apparatus for serial determination of nitrogen in samples by the Kjeldahl method, characterized in that it comprises from 4 to 7 flasks suspended vertically in a rotatable roundabout, each provided with a cover and a side tube extending into a common central container for the collection of combustion products, the roundabout being connected to a device which at regular intervals turns the roundabout one step forward to the next position, means for heating the flasks in one or two of the positions, means for blowing cooling air against the flasks, means for feeding diluent water to the flasks in a following position, means for introducing neutralising chemicals, means for generating and feeding steam to the flasks in the next following position, means for collecting and titrating the distillate, blowing means for emptying the flasks in the last position, and means for opening the covers on completion of the decomposition and for introducing diluent water into the flasks.
Inventors
- 👤 Poul Erik Aegidius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:59
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/002
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
192 words
An analytical apparatus for serial determination of nitrogen in samples by the Kjeldahl method, comprising: a. a roundabout; b. a plurality of flasks suspended vertically by the roundabout, each flask being provided with a cover and a side tube; c. means for removing decomposition products; d. drive means connected to rotate the roundabout stepwise to bring each flask in succession to a first position and advance each flask from the first position into several intermediate positions in succession and bring it back to the first position; e. means for introducing sample material and decomposition material into the flask in the first position; f. means for heating the flask in at least one subsequent intermediate position; g. means for cooling the flask in a following position; h. means for feeding diluent water into the flask in said following position; i. means for introducing neutralizing material and steam into the flask in a further following position; j. means for titrating the distillate from the flask in the said further following position; k. means for emptying the flasks in the last said intermediate positions; l. means for removing the covers on the completion of decomposition.
Claim 2
Dependent Claim
192 words
An analytical apparatus for serial determination of nitrogen in samples by the Kjeldahl method, comprising: a. a roundabout; b. a plurality of flasks suspended vertically by the roundabout, each flask being provided with a cover and a side tube; c. means for removing decomposition products; d. drive means connected to rotate the roundabout stepwise to bring each flask in succession to a first position and advance each flask from the first position into several intermediate positions in succession and bring it back to the first position; e. means for introducing sample material and decomposition material into the flask in the first position; f. means for heating the flask in at least one subsequent intermediate position; g. means for cooling the flask in a following position; h. means for feeding diluent water into the flask in said following position; i. means for introducing neutralizing material and steam into the flask in a further following position; j. means for titrating the distillate from the flask in the said further following position; k. means for emptying the flasks in the last said intermediate positions; l. means for removing the covers on the completion of decomposition.
Claim 3
Dependent Claim
27 words
An apparatus according to claim 1, wherein the number of flasks is six and the drive means are arranged to rotate the roundabout in steps of 60°.
Claim 4
Dependent Claim
43 words
An apparatus according to claim 1, comprising a cylindrical glass vessel for collecting said distillate, a photocell arrangement projecting a vertical light beam through the cylindrical glass vessel, and a feeding device for titration liquid coupled to and controlled by said photocell arrangement.
Claim 5
Dependent Claim
130 words
An apparatus according to claim 1, wherein the roundabout is provided with a plurality of magnets respectively associated with said flasks, and that magnet which is associated with that flask which is in said first position is activated on the feeding of a sample into a flask but remains inactivated if the flask is not supplied with sample material and decomposition material, and wherein when that magnet which is associated with the flask in said subsequent position is in the activated state it initiates supply of heat to said flask, and when that magnet which is associated with the flask in said further following position is in the activated state it initiates introduction of neutralizing material and steam into said flask and collection and titration of distillate from said flask.
Claim 6
Dependent Claim
83 words
An apparatus according to claim 1, wherein the means for introducing steam into the flask in said further following position includes a steam feeding pipe, and a drop catcher comprising first and second bulbs interconnected by a tube which opens tangentially into the second bulb, the steam feeding pipe extending through the first bulb, and the second bulb being provided with a discharge tube issuing from a point at or adjacent to the centre of the second bulb and communicating with a condenser.
Claim 7
Dependent Claim
36 words
An apparatus according to claim 1, wherein the means for removing decomposition products comprise a container for collection of decomposition products, said container being disposed centrally of the flasks and having the side tubes extending thereinto.
Claim 8
Dependent Claim
16 words
An apparatus according to claim 1, wherein the means for emptying the flasks comprise blowing means.
References Cited (Backward Citations)
US3103471A
Cited
US2726936A
Cited
US3174829A
Cited
US3461042A
Cited
US3335097A
Cited
US3616273A
Cited
US3790346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |