US4197329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blood filming process
Assignee: Dynatech Corp
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Filing: 1975-03-10
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Granted: 1980-04-08
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Expires: 1995-03-10
Abstract
Abstract An improved liquid-filming apparatus of the type which utilizes centrifugal action to distribute blood on a specimen-display surface, i.e. on a conventional laboratory slide, and which utilizes a waste-collecting means about the perimeter of the slide display surface. The invention is based on the discovery that the display surface is advantageously related to the surrounding structure in such a way that blood does not disintegrate into minute droplets upon leaving the slide surface and before it can be immobilized in the collecting means. By providing a transitional blood-receiving surface immediately adjacent the supply surface, applicant has avoided the problem of such disintegration.
Inventors
- 👤 Joseph A. Holroyd
- 👤 Robert K. Mitchiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:51
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/2813; G01N2001/2846
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
141 words
In a process for centrifugal distribution of liquid physiological specimens over a display surface wherein specimen waste which is spun off the display surface during said centrifugal distribution is captured by a waste-receiving means mounted proximate to and adapted to rotate with said display surface, the improvement comprising the steps of a. placing said display surface in a well surrounded by a smooth deck which is spaced up to about 0.025 inch from said specimen display surface, and which is vertically displaced from the plane of said display surface by less than about 0.005 inch and b. spinning said display surface, causing said specimen waste to leave said display surface, and to be conveyed on said deck into said waste-receiving means, said deck serving to maintain the structural integrity of said waste during its transit between display surface and waste-receiving means.
Claim 2
Dependent Claim
141 words
In a process for centrifugal distribution of liquid physiological specimens over a display surface wherein specimen waste which is spun off the display surface during said centrifugal distribution is captured by a waste-receiving means mounted proximate to and adapted to rotate with said display surface, the improvement comprising the steps of a. placing said display surface in a well surrounded by a smooth deck which is spaced up to about 0.025 inch from said specimen display surface, and which is vertically displaced from the plane of said display surface by less than about 0.005 inch and b. spinning said display surface, causing said specimen waste to leave said display surface, and to be conveyed on said deck into said waste-receiving means, said deck serving to maintain the structural integrity of said waste during its transit between display surface and waste-receiving means.
Claim 3
Dependent Claim
23 words
A process as defined in claim 1 wherein said liquid-waste tends to form elongate, fiber shaped masses when tensile stress is applied thereto.
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) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |