Patent US2262210A successfully refreshed from Google Patents.
Patent US3929416A successfully refreshed from Google Patents.
US3929416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for producing gypsum lumps
Assignee: Hitachi Ltd
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Filing: 1973-05-08
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Granted: 1975-12-30
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Expires: 1993-05-08
Abstract
Abstract When limestone is reacted with sulfuric acid to produce gypsum, the limestone and sulfuric acid, which are continuously fed to a reactor, are moved through the reactor and a discharger while rotating reactants and products in course of a gypsum-forming process. Gypsum lumps are continuously obtained as a product thereby.
Inventors
- 👤 Hirobumi Tanaka
- 👤 Norio Arashi
- 👤 Yukio Hishinuma
- 👤 Zensuke Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:12
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/46
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
109 words
AN APPARATUS FOR PRODUCING SOLIDIFIED GYPSUM LUMPS COMPRISING AN INVERTED CONICAL REACTOR HAVING AN INLET IN AN UPPER PORTION THEREOF FOR SUPPLYING SULFURIC ACID AND LIMESTONE AND AN OUTLET AT A LOWER PORTION THEREOF, DISCHARGEING MEANS ARRANGED AT THE OUTLET OF SAID REACTOR FOR CONVEYING GYPSUM LUMPS PRODUCED IN SAID REACTOR, A ROTATING SHAFT VERTICALLY DISJPOSED IN SAID REACTOR, AND A PLURALITY OF SECTOR BLADES ARRANGED IN A STAGGERED RELATIONSHIP AROUND SAID ROTATING SHAFT, EACH BLADE BEING ARRANGED AT AN INCLINED ANGLE WITH RESPECT TO THE AXIS OF SAID ROTATING SHAFT, THE OUTER PERIPHERIES OF THE SECTOR BLADES EXTENDING TO NEAR THE INNER SURFACE OF SAID INVERTED CONICAL REACTOR.
Claim 2
Independent Claim
109 words
AN APPARATUS FOR PRODUCING SOLIDIFIED GYPSUM LUMPS COMPRISING AN INVERTED CONICAL REACTOR HAVING AN INLET IN AN UPPER PORTION THEREOF FOR SUPPLYING SULFURIC ACID AND LIMESTONE AND AN OUTLET AT A LOWER PORTION THEREOF, DISCHARGEING MEANS ARRANGED AT THE OUTLET OF SAID REACTOR FOR CONVEYING GYPSUM LUMPS PRODUCED IN SAID REACTOR, A ROTATING SHAFT VERTICALLY DISJPOSED IN SAID REACTOR, AND A PLURALITY OF SECTOR BLADES ARRANGED IN A STAGGERED RELATIONSHIP AROUND SAID ROTATING SHAFT, EACH BLADE BEING ARRANGED AT AN INCLINED ANGLE WITH RESPECT TO THE AXIS OF SAID ROTATING SHAFT, THE OUTER PERIPHERIES OF THE SECTOR BLADES EXTENDING TO NEAR THE INNER SURFACE OF SAID INVERTED CONICAL REACTOR.
Claim 3
Dependent Claim
80 words
The apparatus of claim 1, wherein said discharging means comprises a cylindrical vessel having an inlet at one end thereof communicating with the outlet of said inverted conical reactor, an outlet at the other end of said cylindrical vessel, a rotating shaft disposed in said cylindrical vessel, and a plurality of blades arranged in staggered relationship around said shaft, each blade being positioned at an inclined angle with respect to the axis of the rotating shaft in said cylindrical vessel.
Claim 4
Dependent Claim
32 words
The apparatus of claim 2, further comprising first driving means for rotating the rotating shaft in said reactor and a second driving means for rotating the rotating shaft in said cylindrical vessel.
Claim 5
Dependent Claim
20 words
The apparatus of claim 3, wherein said first drive means and said second drive means operate independently of one another.
Claim 6
Dependent Claim
31 words
The apparatus of claim 4, further comprising control means for controlling the rotation of the rotating shaft in said cylindrical vessel in response to the level of materials in said reactor.
Claim 7
Dependent Claim
26 words
The apparatus of claim 2, wherein said sector blades slightly overlap one another when viewed from a direction perpendicular to the rotating shaft in said reactor.
Claim 8
Dependent Claim
28 words
The apparatus of claim 2, wherein said sector blades slightly overlap one another when viewed from the axial direction with respect to the rotating shaft in said reactor.
Claim 9
Dependent Claim
25 words
The apparatus of claim 2, wherein said sector blades are curved to improve the downward flow of the reacting mixture engaged by said sector blades.
Claim 10
Dependent Claim
64 words
The apparatus of claim 2, wherein said sector blades define a leading edge and a trailing edge defining with said leading edge an apex mounted on the rotating shaft in said reactor, said sector blades further defining a curved edge opposite said apex, the curved edge of each conical blade conforming to the portion of the reactor through which each respective conical blade rotates.
Claim 11
Dependent Claim
24 words
The apparatus of claim 9, wherein the trailing edge of each sector blade radially overlaps the leading edge of the adjacent higher sector blade.
Claim 12
Dependent Claim
20 words
The apparatus of claim 10, wherein the apexes of said sector blades define angles of about 120* to about 160*.
Claim 13
Dependent Claim
11 words
The apparatus of claim 11, wherein said sector blades are curved.
Claim 14
Dependent Claim
11 words
The apparatus of claim 10, wherein said sector blades are curved.
Claim 15
Dependent Claim
25 words
The apparatus of claim 10, wherein the leading edge of each sector blade horizontally overlaps the trailing edge of the next adjacent higher sector blade.
Claim 16
Dependent Claim
20 words
The apparatus of claim 14, wherein the apexes of said sector blades define angles of about 120* to about 160*.
Claim 17
Dependent Claim
26 words
The apparatus of claim 1, wherein said sector blades tightly overlap one another when viewed from a direction perpendicular to the rotating shaft in said reactor.
Claim 18
Dependent Claim
28 words
The apparatus of claim 1, wherein said sector blades slightly overlap one another when viewed from the axial direction with respect to the rotating shaft in said reactor.
Claim 19
Dependent Claim
64 words
The apparatus of claim 1, wherein said sector blades define a leading edge and a trailing edge defining with said leading edge an apex mounted on the rotating shaft in said reactor, said sector blades further defining a curved edge opposite said apex, the curved edge of each conical blade conforming to the portion of the reactor through which each respective conical blade rotates.
Claim 20
Dependent Claim
24 words
The apparatus of claim 18, wherein the trailing edge of each sector blade radially overlaps the leading edge of the adjacent higher sector blade.
Claim 21
Dependent Claim
25 words
The apparatus of claim 19, wherein the leading edge of each sector blade horizontally overlaps the trailing edge of the next adjacent higher sector blade.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |