US3865552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Test tube
Assignee: Blood Services
•
Filing: 1973-05-07
•
Granted: 1975-02-11
•
Expires: 1993-05-07
Abstract
Abstract A closed-bottom test tube has a lower inner surface coated with a reagent. A slidable portion sealingly engaging the inner wall of the test tube is inserted downwardly to maintain a quantity of liquid in continuous contact with the reagent. Pressure relief means within the piston provides for the discharge of air trapped between the piston and the liquid.
Inventors
- 👤 Judith Marston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:10
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/508; B01L3/5082; Y; Y10; Y10S; Y10S436/00; Y10S436/804; Y10S436/807; Y10S436/81; Y10S436/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
178 words
A TEST-TUBE ASSEMBLY SPECIALLY ADAPTED FOR TRANSPORTING A SMALL QUANTITY OF A LIQUID WHILE MAINTAINING SAID LIQUID IN CONTINUOUS CONTACT WITH A REAGENT COATED ON THE INNER SURFACE OF THE BOTTOM OF SAID TEST TUBE, SAID ASSEMBLY COMPRISING: A. AN ELONGATE, HOLLOW TEST TUBE, CLOSED ON THE BOTTOM END; B. A QUANTITY OF SAID REAGENT DISPOSED AS A COATING ON THE INNER SURFACE OF THE BOTTOM OF SAID TEST TUBE; C. A PISTON MEMBER SHAPED AND DIMENSIONED TO BE SLIDABLY RECEIVED DOWNWARDLY IN AND TRANSVERSELY ACROSS SAID TEST TUBE, SEALINGLY PERIPHERALLY ENGAGING THE INNER WALL OF SAID TEST TUBE, D. AN OPERATING HANDLE MEMBER EXTENDING UPWARDLY FROM SAID PISTON FOR INSERTING SAID PISTON MEMBER DOWNWARDLY INTO SAID TEST TUBE TO A POINT SPACED ABOVE THE BOTTOM THEREOF AT A DISTANCE TO MAINTAIN SAID LIQUID IN CONTINUOUS CONTACT WITH SAID REAGENT; AND E. MEANS DEFINING A PRESSURE-RELIEF APARTURE IN SAID PISTON MEMBER, SAID APERTURE SIZED TO BE SENSITIVE TO THE VISCOSITY COEFFICIENT DIFFERENTIAL BETWEEN SAID LIQUID AND AIR WHEREBY AIR MAY PASS THERETHROUGH, BUT NO LIQUID UNDER TRANSPORTING CONDITIONS.
Claim 2
Dependent Claim
178 words
A TEST-TUBE ASSEMBLY SPECIALLY ADAPTED FOR TRANSPORTING A SMALL QUANTITY OF A LIQUID WHILE MAINTAINING SAID LIQUID IN CONTINUOUS CONTACT WITH A REAGENT COATED ON THE INNER SURFACE OF THE BOTTOM OF SAID TEST TUBE, SAID ASSEMBLY COMPRISING: A. AN ELONGATE, HOLLOW TEST TUBE, CLOSED ON THE BOTTOM END; B. A QUANTITY OF SAID REAGENT DISPOSED AS A COATING ON THE INNER SURFACE OF THE BOTTOM OF SAID TEST TUBE; C. A PISTON MEMBER SHAPED AND DIMENSIONED TO BE SLIDABLY RECEIVED DOWNWARDLY IN AND TRANSVERSELY ACROSS SAID TEST TUBE, SEALINGLY PERIPHERALLY ENGAGING THE INNER WALL OF SAID TEST TUBE, D. AN OPERATING HANDLE MEMBER EXTENDING UPWARDLY FROM SAID PISTON FOR INSERTING SAID PISTON MEMBER DOWNWARDLY INTO SAID TEST TUBE TO A POINT SPACED ABOVE THE BOTTOM THEREOF AT A DISTANCE TO MAINTAIN SAID LIQUID IN CONTINUOUS CONTACT WITH SAID REAGENT; AND E. MEANS DEFINING A PRESSURE-RELIEF APARTURE IN SAID PISTON MEMBER, SAID APERTURE SIZED TO BE SENSITIVE TO THE VISCOSITY COEFFICIENT DIFFERENTIAL BETWEEN SAID LIQUID AND AIR WHEREBY AIR MAY PASS THERETHROUGH, BUT NO LIQUID UNDER TRANSPORTING CONDITIONS.
References Cited (Backward Citations)
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US3464798A
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US3615222A
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US3768979A
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US3802843A
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US3748099A
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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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |