US4270923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pretreatment agent for subject fluid in pregnancy test
Assignee: Takeda Pharmaceutical Co Ltd
•
Filing: 1979-12-26
•
Granted: 1981-06-02
•
Expires: 1999-12-26
Abstract
Abstract By using a new pretreatment agent consisting essentially of a carboxylic acid-type cation exchange resin fiber or a siliconized glass fiber, the interfering components and the elements of turbidity present in a subject fluid for immunologic pregnancy test can be specifically removed without entailing a substantial loss of human chorionic gonadotropin contained in the subject fluid.
Inventors
- 👤 Koichi Kondo
- 👤 Isamu Yoshida
- 👤 Takashi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:30
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/74; G01N33/76; Y; Y10; Y10S; Y10S436/00; Y10S436/811; Y10S436/814; Y10S436/815; Y10S436/817; Y10S436/818; Y10S436/825
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A method for pretreating a subject fluid for a pregnancy test by means of an immunologic assay of human chorionic gonadotropin, which comprises removing the interfering components and turbidity from the subject fluid by contacting the subject fluid with a carboxylic acid-type cation exchange resin fiber having a cation exchange capacity of about 5 to 8 meq/g or a siliconized glass fiber prepared by impregnating a glass fiber with a solution of dimethylpolysiloxane and heating the fiber.
Claim 2
Independent Claim
77 words
A method for pretreating a subject fluid for a pregnancy test by means of an immunologic assay of human chorionic gonadotropin, which comprises removing the interfering components and turbidity from the subject fluid by contacting the subject fluid with a carboxylic acid-type cation exchange resin fiber having a cation exchange capacity of about 5 to 8 meq/g or a siliconized glass fiber prepared by impregnating a glass fiber with a solution of dimethylpolysiloxane and heating the fiber.
Claim 3
Dependent Claim
15 words
A method according to claim 1, wherein the subject fluid is woman's urine or serum.
Claim 4
Dependent Claim
28 words
A method according to claim 1, wherein the subject fluid is filtered through a layer of the carboxylic acid-type cation exchange resin fiber or the siliconized glass fiber.
Claim 5
Dependent Claim
28 words
A method according to claim 3, wherein the resin fiber is in the form of filament or staple fiber with a denier number of about 2 to 15.
Claim 6
Dependent Claim
29 words
A method according to claim 3, wherein the layer is of the siliconized glass fiber in the form of filament with a diameter of about 5 to 15 μm.
Claim 7
Dependent Claim
26 words
A method according to claim 3, wherein the amount of the fibrous layer is about 20 to 100 mg per 0.3 ml of the subject fluid.
References Cited (Backward Citations)
US3215500A
Cited
US3171783A
Cited
US3594993A
Cited
US3873682A
Cited
US3901657A
Cited
US4160644A
Cited
US4138214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |