Patent US4497726A successfully refreshed from Google Patents.
Patent US3734358A successfully refreshed from Google Patents.
US3734358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for applying suction having automatic cutoff of displacement volume
Assignee: General Electric Co
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Filing: 1971-07-27
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Granted: 1973-05-22
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Expires: 1991-07-27
Abstract
Abstract A device is described herein for successively applying pressure and suction to a volume in flow communication therewith. The device is preferably applied to introducing liquid into and permitting the drainage of liquid from, the internal volume of a hollow longitudinally-extending member; (e.g. a disposable sterile pipette).
Inventors
- 👤 J Bergeron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:25
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/0213; B01L3/0217
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
A device for successively applying pressure and suction to a volume in flow communication therewith comprising in combination: a. a hollow longitudinally-extending walled member defining a straight bore, said member being open at only one end and b. sealing means disposed adjacent said one end, said sealing means being adapted to receive the outer wall of a hollow cylinder in sealing engagement to place the interior thereof in flow communication with said bore through said one end, c. said member having a small orifice extending through the longitudinal wall thereof from said bore to the ambient thereby limiting the length of said bore effective for the application of pressure and suction.
Claim 2
Independent Claim
111 words
A device for successively applying pressure and suction to a volume in flow communication therewith comprising in combination: a. a hollow longitudinally-extending walled member defining a straight bore, said member being open at only one end and b. sealing means disposed adjacent said one end, said sealing means being adapted to receive the outer wall of a hollow cylinder in sealing engagement to place the interior thereof in flow communication with said bore through said one end, c. said member having a small orifice extending through the longitudinal wall thereof from said bore to the ambient thereby limiting the length of said bore effective for the application of pressure and suction.
Claim 3
Dependent Claim
22 words
The device of claim 1 wherein the sealing means is located within the bore of the member along the inner surface thereof.
Claim 4
Dependent Claim
47 words
The device of claim 1 wherein the walled member has a cylindrical barrel and a piston in the bore of said barrel provides closure of said bore at The opposite end thereof from the one end, said piston being selectively movable to cover and uncover the orifice.
References Cited (Backward Citations)
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Cited
US1791829A
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US2348831A
Cited
US2752074A
Cited
US3346147A
Cited
US3594906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |