US4258761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rehydrator
Assignee: Sandy Spring Instrument Co Inc
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Filing: 1979-05-03
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Granted: 1981-03-31
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Expires: 1999-05-03
Abstract
Abstract The rehydrator is comprised of a first plate having a plurality of hollow tubes secured in through apertures and extending from one side of the plate perpendicular thereto. A plurality of rods are secured to a second plate disposed parallel to the first plate and extend through respective tubes in the first plate. The second plate is guided for movement toward and away from the first plate on a plurality of guide rods and springs are provided to normally bias the second plate away from the first plate. The rods slide loosely within the tubes and upon movement of the second plate downwardly into engagement with the first plate, the ends of the rods will extend beyond the tubes so that upon immersion of the ends of the rods and tubes into a solution, the withdrawal of the rods into the tubes will cause a predetermined amount of fluid to be drawn into the tube. Subsequent extension of the rods past the ends of the tubes will cause the liquid therein to be dispensed into appropriate receptacles aligned with each tube.
Inventors
- 👤 John T. Bennett, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:06
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0217; G; G01; G01N; G01N35/00; G01N2035/00178; G01N2035/00237
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
200 words
A rehydrator comprising first plate means having at least one aperture extending therethrough, at least one barrel means secured in said aperture and extending downwardly perpendicular to said first plate means, said barrel means having an end remote from said first plate means adapted to be immersed in a liquid guide means secured to said first plate means and extending upwardly perpendicular thereto, second plate means guided on said guide means for reciprocating movement toward and away from said first plate means and at least one plunger means mounted for movement with said second plate means and extending into said barrel means for sliding movement therein, said plunger means having a loose fit within said barrel means and having a length such as to extend beyond said end of said barrel means when said second plate means is moved into engagement with said first plate means and said end of said barrel means is immersed in a liquid to wet the end of said plunger to form a liquid seal between said plunger and said barrel so that upon retraction of said plunger means a predetermined amount of liquid will be drawn upwardly within the end of said barrel means.
Claim 2
Dependent Claim
200 words
A rehydrator comprising first plate means having at least one aperture extending therethrough, at least one barrel means secured in said aperture and extending downwardly perpendicular to said first plate means, said barrel means having an end remote from said first plate means adapted to be immersed in a liquid guide means secured to said first plate means and extending upwardly perpendicular thereto, second plate means guided on said guide means for reciprocating movement toward and away from said first plate means and at least one plunger means mounted for movement with said second plate means and extending into said barrel means for sliding movement therein, said plunger means having a loose fit within said barrel means and having a length such as to extend beyond said end of said barrel means when said second plate means is moved into engagement with said first plate means and said end of said barrel means is immersed in a liquid to wet the end of said plunger to form a liquid seal between said plunger and said barrel so that upon retraction of said plunger means a predetermined amount of liquid will be drawn upwardly within the end of said barrel means.
Claim 3
Dependent Claim
43 words
A rehydrator as set forth in claim 1, further comprising a plurality of apertures extending through said first plate means, a plurality of barrel means secured in said apertures and a plurality of plunger means mounted for movement with said second plate means.
Claim 4
Dependent Claim
53 words
A rehydrator as set forth in claim 1, further comprising adjustable limit stop means on said guide means for limiting movement of said second plate means away from said first plate means and spring means associated with said guide means for normally biasing said second plate means away from said first plate means.
Claim 5
Dependent Claim
39 words
A rehydrator as set forth in claim 1, further comprising housing means for supporting said first plate means in predetermined relationship to reservoir means and microtube tray means adapted to be disposed beneath said barrel means and plunger means.
Claim 6
Dependent Claim
23 words
A rehydrator as set forth in claim 1, further comprising actuator means for moving said second plate means towards said first plate means.
Claim 7
Dependent Claim
21 words
A rehydrator as set forth in claim 1, wherein said plunger means has a loose sliding fit within said barrel means.
Claim 8
Dependent Claim
21 words
A rehydrator as set forth in claim 6, wherein the upper end of each plunger means is rounded to accomodate misalignments.
Claim 9
Dependent Claim
114 words
A rehydrator comprising hollow elongated barrel means having an end adapted to be immersed in a liquid, plunger means having a loose sliding fit located within said barrel means and means for guiding said plunger means for reciprocating movement within said barrel means, said plunger means having a length sufficient to extend beyond said end of said barrel means in one extreme position of movement when said end is immersed in liquid to wet the end of said plunger to form a liquid seal between said plunger and said barrel so that upon retraction of said plunger means a predetermined amount of liquid will be drawn upwardly within the end of said barrel means.
Claim 10
Dependent Claim
114 words
A rehydrator comprising hollow elongated barrel means having an end adapted to be immersed in a liquid, plunger means having a loose sliding fit located within said barrel means and means for guiding said plunger means for reciprocating movement within said barrel means, said plunger means having a length sufficient to extend beyond said end of said barrel means in one extreme position of movement when said end is immersed in liquid to wet the end of said plunger to form a liquid seal between said plunger and said barrel so that upon retraction of said plunger means a predetermined amount of liquid will be drawn upwardly within the end of said barrel means.
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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) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |