US4098579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Installation for conducting a synthesis reaction of urea
Assignee: Instytut Nawozow Sztucznych
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Filing: 1977-03-03
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Granted: 1978-07-04
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Expires: 1997-03-03
Abstract
Abstract Apparatus for synthesis of urea comprising a reaction vessel divided into a number of adjacent reaction zones by means of overflow-preventing plates with moving elements that are non-return valves.
Inventors
- 👤 Janusz Starzycki
- 👤 Jadwiga Starzycka
- 👤 Janusz Sobczak
- 👤 Stanislaw Golembiowski
- 👤 Ernest Pieczora
- 👤 Stanislaw Kolanek
- 👤 Jerzy Simonides
- 👤 Jozef Jendrzej
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:52
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/02; C07C273/04; B; B01; B01J; B01J19/00; B01J19/24; B01J3/00; B01J3/04; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/00761; B01J2219/00763; B01J2219/00765; B01J2219/00777; B01J2219/18; B01J2219/185; B01J2219/19; B01J2219/194; B01J2219/1941; B01J2219/1943; Y; Y02; Y02P; Y02P20/00; Y02P20/141
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
In an apparatus for the synthesis of urea comprising (a) a vertically disposed reaction vessel having at least two fluid inlets thereto near the base thereof and at least one fluid outlet therefrom near the top thereof, and (b) a plurality of vertically spaced, horizontally disposed overflow-preventing baffle plates having a plurality of orifices therein and being mounted within said vessel, each of said baffle plates extending across the entire interior horizontal cross section of said vessel, (c) the improvement comprising non-return valves mounted in each of said orifices whereby reaction fluid flows upward through said vessel and through said orifices and valves, said valves preventing the downward backflow of reaction fluid and thus providing for unidirectional upward flow through the reaction vessel.
Claim 2
Dependent Claim
123 words
In an apparatus for the synthesis of urea comprising (a) a vertically disposed reaction vessel having at least two fluid inlets thereto near the base thereof and at least one fluid outlet therefrom near the top thereof, and (b) a plurality of vertically spaced, horizontally disposed overflow-preventing baffle plates having a plurality of orifices therein and being mounted within said vessel, each of said baffle plates extending across the entire interior horizontal cross section of said vessel, (c) the improvement comprising non-return valves mounted in each of said orifices whereby reaction fluid flows upward through said vessel and through said orifices and valves, said valves preventing the downward backflow of reaction fluid and thus providing for unidirectional upward flow through the reaction vessel.
Claim 3
Dependent Claim
11 words
The apparatus of claim 1 wherein the non-return valves are spherical.
Claim 4
Dependent Claim
11 words
The apparatus of claim 1 wherein the non-return valves are mushroom-shaped.
Claim 5
Dependent Claim
11 words
The apparatus of claim 1 wherein the non-return valves are hemispherical.
Claim 6
Dependent Claim
11 words
The apparatus of claim 1 wherein the non-return valves are cone-shaped.
Claim 7
Dependent Claim
11 words
The apparatus of claim 1 wherein the non-return valves are plate-shaped.
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |