US4770856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microtiter plate for blood typing
Assignee: Biotest Serum Institut GmbH
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Filing: 1987-10-29
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Granted: 1988-09-13
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Expires: 2007-10-29
Abstract
Abstract A microtiter plate for blood typing consisting of a flat-bottomed plate of rigid transparent polystyrene having a plurality of wells, the polystyrene being surface treated by a corona and/or plasma method of applying high power electric energy at high frequency resulting in a permanently measurable negative ion-charge at the surface of the wells, and layers of substantially pure antiserums dried on the wells without any binder from a suspension or solution of the antiserums and tightly but releasably bound to the polystryene.
Inventors
- 👤 Horst Uthemann
- 👤 Dieter Merz
- 👤 Hans Schleussner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:29
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/508; B01L3/5085; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/80; Y; Y10; Y10S; Y10S422/00; Y10S422/906; Y10S422/907; Y10S436/00; Y10S436/807; Y10S436/809
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A microtiter plate for blood typing consisting of a flat-bottomed plate of rigid transparent polystyrene having a plurality of wells, and polystyrene being surface treated by a corona and/or plasma method of applying high power electric energy at high frequency resulting in a permanently measurable negative ion-charge at the surface of the wells, and layers of substantially pure antiserums dried on the wells without any binder from a suspension or solution of the antiserums and tightly but releasably bound to the polystryene.
Claim 2
Dependent Claim
82 words
A microtiter plate for blood typing consisting of a flat-bottomed plate of rigid transparent polystyrene having a plurality of wells, and polystyrene being surface treated by a corona and/or plasma method of applying high power electric energy at high frequency resulting in a permanently measurable negative ion-charge at the surface of the wells, and layers of substantially pure antiserums dried on the wells without any binder from a suspension or solution of the antiserums and tightly but releasably bound to the polystryene.
Claim 3
Dependent Claim
11 words
A plate according to claim 1, wherein the wells are U-shaped.
Claim 4
Dependent Claim
11 words
A place according to claim 1, wherein the wells are cylindrical.
Claim 5
Dependent Claim
12 words
A plate according to claim 1, wherein the polystyrene has been radiation-sterilized.
Claim 6
Dependent Claim
57 words
A plate according to claim 1, wherein the bottom of one well is coated with antiserum A, the bottom of another with antiserum B, the bottom of another with antiserum AB, the bottom of another with AB serum, the bottom of another with IgG specific to anti-D, and the bottom of another with IgG specific to anti-CDE.
Claim 7
Dependent Claim
28 words
A plate according to claim 1, wherein the bottom of the wells independently contain at least two different antisera and each different antiserum is of a different color.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |