US3850348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for injection of liquid
Assignee: Bpifrance Financement SA
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Filing: 1973-02-09
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Granted: 1974-11-26
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Expires: 1993-02-09
Abstract
Abstract A portable apparatus for the slow and continuous injection of liquid for feeding small quantities of liquid over considerable periods of time. The apparatus is generally cylindrical in shape and includes two coaxial casings: an outer transparent casing which is relatively rigid and an inner deformable casing. At its upper end the apparatus is adapted to be connected to a source of compressed gas by means of a auto tire-type valve and at its lower end the outlet flow rate is controlled by a porous plug. A manometric measuring device is arranged in the inner casing which comprises a piston-and-cylinder unit with color bands for indicating the pressure therein.
Inventors
- 👤 J Lion
- 👤 F Valentin
- 👤 M Bessot
- 👤 C Delacote
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:49
CPC Classifications
A; A61; A61M; A61M5/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
228 words
Apparatus for slowly injecting a liquid comprising an inner cylinder casing of flexible material for containing the liquid to be injected; a closed transparent outer cylindrical casing surrounding said inner cylindrical casing; means providing restricted egress of liquid from said inner cylindrical casing including an outlet tube communicating with said inner cylindrical casing and extending through said outer cylindrical casing in sealed relation thereto; means for admitting fluid under pressure into said outer cylindrical casing and outside of said inner cylindrical casing to press upon the latter in a collapsing sense to force liquid from said inner cylindrical casing through said outlet tube; a cylinder fitted within one end of said inner cylindrical casing which is remote from the communication of the latter with said outlet tube, said cylinder having a closed end within said inner cylindrical casing and an open opposite end; and a pressure indicator piston member reciprocable in said cylinder and having a portion projecting beyond said opposite end of the latter, said piston member being movable relatively to said inner cylindrical casing in response to fluid pressure in said outer cylindrical casing, whereby the moved position of said indicator piston member relative to said inner cylindrical casing indicates the fluid pressure acting on said inner cylindrical casing, the pressure indicating position of said indicator piston member being visible through said transparent outer cylindrical casing.
Claim 2
Dependent Claim
228 words
Apparatus for slowly injecting a liquid comprising an inner cylinder casing of flexible material for containing the liquid to be injected; a closed transparent outer cylindrical casing surrounding said inner cylindrical casing; means providing restricted egress of liquid from said inner cylindrical casing including an outlet tube communicating with said inner cylindrical casing and extending through said outer cylindrical casing in sealed relation thereto; means for admitting fluid under pressure into said outer cylindrical casing and outside of said inner cylindrical casing to press upon the latter in a collapsing sense to force liquid from said inner cylindrical casing through said outlet tube; a cylinder fitted within one end of said inner cylindrical casing which is remote from the communication of the latter with said outlet tube, said cylinder having a closed end within said inner cylindrical casing and an open opposite end; and a pressure indicator piston member reciprocable in said cylinder and having a portion projecting beyond said opposite end of the latter, said piston member being movable relatively to said inner cylindrical casing in response to fluid pressure in said outer cylindrical casing, whereby the moved position of said indicator piston member relative to said inner cylindrical casing indicates the fluid pressure acting on said inner cylindrical casing, the pressure indicating position of said indicator piston member being visible through said transparent outer cylindrical casing.
Claim 3
Dependent Claim
44 words
Apparatus according to claim 1 in which the portion of said piston projecting beyond said open opposite end of said cylinder is marked differently along said portion to assist in visually determining the amount of projection of said portion beyond said open opposite end.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |