US4071319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contaminant detector
Assignee: Becton Dickinson and Co
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Filing: 1976-11-26
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Granted: 1978-01-31
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Expires: 1996-11-26
Abstract
Abstract Apparatus for the detection of contaminants in fluids. In the simplest embodiment, the apparatus comprises a vacuum tube having indicator means disposed therein for the detection of a fluid-borne contaminant and a self-sealing, cannula-penetrable closure. The apparatus is operated by piercing the closure with a cannula to draw the fluid for testing into the vacuum chamber.
Inventors
- 👤 Edward L. Nugent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:52
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/508; B01L3/5082; G; G01; G01N; G01N31/00; G01N31/22; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
Apparatus for the detection of fluid-borne contaminants, which comprises: a. a first tubular container having a portal therein; b. a self-sealing, gas-proof, cannula-penetrable closure mounted in said portal, said closure together with said first tubular container defining a hermetically sealed chamber; c. a partial vacuum in said chamber; d. a second tubular container mounted in said first tubular container and having one end in open communication with said chamber and the other end closed by said closure; and e. an indicator for the presence of said contaminants disposed in said second tubular container.
Claim 2
Dependent Claim
93 words
Apparatus for the detection of fluid-borne contaminants, which comprises: a. a first tubular container having a portal therein; b. a self-sealing, gas-proof, cannula-penetrable closure mounted in said portal, said closure together with said first tubular container defining a hermetically sealed chamber; c. a partial vacuum in said chamber; d. a second tubular container mounted in said first tubular container and having one end in open communication with said chamber and the other end closed by said closure; and e. an indicator for the presence of said contaminants disposed in said second tubular container.
Claim 3
Dependent Claim
20 words
Apparatus according to claim 1 wherein said indicators are enclosed within said second tubular container by a fluid permeable filter.
Claim 4
Dependent Claim
49 words
The apparatus of claim 1 which includes means for dividing said chamber into upper and lower compartments sealed from each other, the open end of said second tubular container being in communication with said lower compartment and said means being movable to change the relative size of said compartments.
Claim 5
Dependent Claim
40 words
The apparatus of claim 3 wherein said means for dividing comprises a piston, slidingly mounted on said second tube and forming a sliding seal with the inner walls of said first container and the outer walls of said second container.
Claim 6
Dependent Claim
23 words
The apparatus of claim 4 wherein said piston includes a frictional bearing surface for engagement with the outer walls of said second container.
Claim 7
Dependent Claim
17 words
The apparatus of claim 1 wherein said indicator will detect the presence of a plurality of contaminants.
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) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |