US4570478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentric-cylinder rheometer
Assignee: University of California
•
Filing: 1985-04-08
•
Granted: 1986-02-18
•
Expires: 2005-04-08
Abstract
Abstract A rheometer (10) is disclosed which includes a central cylinder (14) surrounded by a tube (24) having a cylindrical bore (26), the bore (26) being slightly larger than the cylinder (14). A loading cup (44) has an interior cylindrical opening (50) larger than the bore (26) which extends from a first end portion (46) thereof toward a second end portion (48) thereof. The first end portion (46) of the cup (44) is detachably attachable to the tube (24) with the cylindrical opening generally coaxial with the bore (26) of the tube (24). An axial moving structure (34) serves for controllably axially moving the tube (24) relative to the cylinder (14). A measuring device (84) serves for measuring the instantaneous force exerted on the cylinder (14) as the tube (24) moves axially.
Inventors
- 👤 David S. Soong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:16
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
184 words
A rheometer (10) comprising: a central cylinder (14) having an axis (16), a first end (18) and a second end (20); a tube (24) having a cylindrical bore (26), said bore (26) being slightly larger than said cylinder (14) and being positioned thereabout and coaxial therewith, said tube (24) having a first open end (28) and a second open end (30) aligned toward, respectively, said first end (18) and said second end (20) of said cylinder (14); a loading cup (44) having a first end portion (46), a second end portion (48), an interior cylindrical opening (50) larger than said bore (26) and extending from said first end portion (46) toward said second end portion (48), said first end portion (46) of said cup (44) being detachably attachable to said second open end (30) of said tube (24) with said cylindrical opening (50) generally coaxial with said bore (26); axial moving means (34) for controllably axially moving said tube (24) relative to said cylinder (14); and measuring means (84) for measuring instantaneous force exerted on said cylinder (14) as said tube (24) moves axially.
Claim 2
Dependent Claim
184 words
A rheometer (10) comprising: a central cylinder (14) having an axis (16), a first end (18) and a second end (20); a tube (24) having a cylindrical bore (26), said bore (26) being slightly larger than said cylinder (14) and being positioned thereabout and coaxial therewith, said tube (24) having a first open end (28) and a second open end (30) aligned toward, respectively, said first end (18) and said second end (20) of said cylinder (14); a loading cup (44) having a first end portion (46), a second end portion (48), an interior cylindrical opening (50) larger than said bore (26) and extending from said first end portion (46) toward said second end portion (48), said first end portion (46) of said cup (44) being detachably attachable to said second open end (30) of said tube (24) with said cylindrical opening (50) generally coaxial with said bore (26); axial moving means (34) for controllably axially moving said tube (24) relative to said cylinder (14); and measuring means (84) for measuring instantaneous force exerted on said cylinder (14) as said tube (24) moves axially.
Claim 3
Dependent Claim
120 words
A rheometer (10) as set forth in claim 1, wherein said axial moving means (34) includes a test closure (68) having a first end region (70), a second end region (72), an interior cylindrical cavity (74) larger than said bore (26) and extending from said first end region (70) toward said second end region (72), said first end region (70) of said closure (68) being detachably attachable to said second open end (30) of said tube (24) with said cylindrical cavity (74) generally coaxial with said bore (26) when said first end portion (46) of said cup (44) is detached from said second open end (30) of said tube (24), said closure (68) including a pressure relief hole (76) therethrough.
Claim 4
Dependent Claim
79 words
A rheometer (10) as set forth in claim 2 wherein said second open end (30) of said tube (24) includes an outwardly extending mounting flange (32), said first end portion (46) of said cup (44) includes an outwardly extending first matching flange (56) adapted to be fastened to said mounting flange (32), and said first end region (70) of said closure (68) includes an outwardly extending second matching flange (82) adapted to be fastened to said mounting flange (32).
Claim 5
Dependent Claim
52 words
A rheometer (10) as set forth in claim 1, wherein said second open end (30) of said tube (24) includes an outwardly extending mounting flange (32), said first end portion (46) of said cup (44) includes an outwardly extending first matching flange (56) adapted to be fastened to said mounting flange (32).
Claim 6
Dependent Claim
35 words
A rheometer (10) as set forth in claim 1, wherein said axial moving means (34) comprise a hydraulic motor (36) and fastening means (38) for connecting the hydraulic motor (34) to drive the tube (24).
Claim 7
Dependent Claim
32 words
A rheometer (10) as set forth in claim 1, wherein said measuring means (84) comprise a load cell (86) in force conducting relation to said first end (18) of said cylinder (14).
References Cited (Backward Citations)
US2156407A
Cited
DE931199C
Cited
US3803903A
Cited
US3864961A
Cited
US3935729A
Cited
US4062225A
Cited
SU655933A1
Cited
DE2754074A1
Cited
JPS5618742A
Cited
US4299118A
Cited
US4352287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |