US4245495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Needle-type colloid osmometer
Assignee: Hokkaido University
•
Filing: 1978-09-15
•
Granted: 1981-01-20
•
Expires: 1998-09-15
Abstract
Abstract A needle-type colloid osmometer is disclosed. This osmometer comprises a hollow needle body having at least one hole at its outer wall and acting as a part of a pressure sensing chamber, a cylindrical semipermeable membrane fitting the needle body therein, and a sampling chamber receiving the needle body with the membrane. The osmometer is usable for measuring colloid osmotic pressure of blood, lymph, body fluid or the like in the fields of clinical pathology, physiology, biochemistry, biology and the like.
Inventors
- 👤 Yoshihiro Kakiuchi
- 👤 Takashi Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:44
CPC Classifications
G; G01; G01N; G01N13/00; G01N13/04; G01N33/00; G01N33/48; G01N33/483; G01N33/487
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
67 words
A needle-type colloid osmometer comprising a hollow needle body constituting at least a part of a pressure sensing chamber filled with a standard solution and having at least one hole at its outer wall, a cylindrical semipermeable membrane fitting said needle body therein so as to seal at least said hole, and a sampling chamber receiving said needle body with said membrane and filled with a sample.
Claim 2
Dependent Claim
67 words
A needle-type colloid osmometer comprising a hollow needle body constituting at least a part of a pressure sensing chamber filled with a standard solution and having at least one hole at its outer wall, a cylindrical semipermeable membrane fitting said needle body therein so as to seal at least said hole, and a sampling chamber receiving said needle body with said membrane and filled with a sample.
Claim 3
Dependent Claim
30 words
A needle-type colloid osmometer as claimed in claim 1, wherein the inner diameter of said cylindrical semipermeable membrane is slightly smaller than the outer diameter of said hollow needle body.
Claim 4
Dependent Claim
33 words
A needle-type colloid osmometer as claimed in claim 1, wherein said hollow needle body is an injection needle with a tip opening and is sealed as its tip opening with a detachable plug.
Claim 5
Dependent Claim
23 words
A needle-type colloid osmometer as claimed in claim 1, wherein said hollow needle body has 4 to 6 holes at its outer wall.
References Cited (Backward Citations)
US3195346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |