US4003262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring precise micro quantities of fluid samples
Assignee: Becton Dickinson and Co
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Filing: 1974-12-16
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Granted: 1977-01-18
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Expires: 1994-12-16
Abstract
Abstract An apparatus for measuring precise micro quantities of fluid samples is disclosed which uses a precision, disposable, self-filling capillary tube on which a holder is mounted between its ends. A plastic adaptor is mounted on one of the ends so that when a protective shield is mounted on the holder the plastic adaptor makes sealing contact with the inner surfaces of the shield. The portion of the shield extending above the adaptor forms an overflow chamber which is utilized for mixing the fluid with a diluent. A vent is provided in the closed end of the shield so that the capillary tube is open to atmospheric pressure to permit the tube to fill with the sample while the shield is mounted in place on the holder.
Inventors
- 👤 Horace W. Gerarde, deceased
- 👤 Executor By The Midlantic National Bank Citizens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:36
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/15; A61B5/150007; A61B5/150015; A61B5/150022; A61B5/150206; A61B5/150213; A61B5/150259; A61B5/150343; A61B5/151; A61B5/15142; B; B01; B01L; B01L3/00; B01L3/02; B01L3/021
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
An apparatus for measuring and diluting precise quantities of fluid samples comprising: a precision, self-filling capillary tube having the capability of holding a volume greater than 50 microliters; a holder having a longitudinally extending bore therethrough, said capillary being mounted in said bore and disposed so that said holder is positioned between the ends of the capillary, said bore providing an interference fit for holding the capillary tube in fixed position in said holder; a shield removably mounted on the holder and telescopically positioned over one end portion of said capillary tube; an adaptor mounted on said one end of said capillary tube and having surfaces thereon for making sealing contact with the inner surface of said shield so that the portion of said shield extending above said adaptor forms an overflow chamber; said shield having a vent formed in the closed end thereof so that the capillary tube is open to atmospheric pressure to permit said fluid samples to fill said tube by capillary action.
Claim 2
Independent Claim
166 words
An apparatus for measuring and diluting precise quantities of fluid samples comprising: a precision, self-filling capillary tube having the capability of holding a volume greater than 50 microliters; a holder having a longitudinally extending bore therethrough, said capillary being mounted in said bore and disposed so that said holder is positioned between the ends of the capillary, said bore providing an interference fit for holding the capillary tube in fixed position in said holder; a shield removably mounted on the holder and telescopically positioned over one end portion of said capillary tube; an adaptor mounted on said one end of said capillary tube and having surfaces thereon for making sealing contact with the inner surface of said shield so that the portion of said shield extending above said adaptor forms an overflow chamber; said shield having a vent formed in the closed end thereof so that the capillary tube is open to atmospheric pressure to permit said fluid samples to fill said tube by capillary action.
Claim 3
Dependent Claim
42 words
The apparatus of claim 1 wherein said adaptor is formed of a plastic material and said surfaces adapted to engage said shield capable of being deformed to form a liquid tight seal between said adaptor and said inner surfaces of said shield.
Claim 4
Dependent Claim
30 words
The apparatus of claim 1 wherein a second shield is removably mounted over the other end of said capillary to prevent contamination and breakage of the assembly prior to use.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |