US3840209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow controlling devices
Assignee: BIOMEDICAL DYNAMICS Corp MINNEAPOLIS MN A CORP OF
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Filing: 1972-07-24
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Granted: 1974-10-08
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Expires: 1992-07-24
Abstract
Abstract A rate-of-flow control device for fluids consists of a tubular body of elastically deformable material and a screw having a sharp-peaked thread screw into the tube to a variable extent for the sharp peak to indent the inner wall of the tube and thus to provide a continuous, enclosed spiral duct through which the fluid flows. The body may be the plug of a rotary plug valve. The device may be adapted to the carburation of fuel to an I.C. engine.
Inventors
- 👤 G James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:10
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/02; F16L55/027; F16L55/02772
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
A device for controlling the rate of flow of fluid, comprising a body of deformable plastic material having a plainwalled cylindrical cavity therein, a metal screw having a sharppeaked screw thread thereon threaded into said cylindrical cavity, the internal diameter of the cavity being smaller than the external diameter of the screw thread but being substantially larger than the root diameter of the screw thread thereby to define between said screw and said body a spiral duct for fluid, said body having a discharge orifice, and means to vary the length of said duct.
Claim 2
Independent Claim
94 words
A device for controlling the rate of flow of fluid, comprising a body of deformable plastic material having a plainwalled cylindrical cavity therein, a metal screw having a sharppeaked screw thread thereon threaded into said cylindrical cavity, the internal diameter of the cavity being smaller than the external diameter of the screw thread but being substantially larger than the root diameter of the screw thread thereby to define between said screw and said body a spiral duct for fluid, said body having a discharge orifice, and means to vary the length of said duct.
Claim 3
Dependent Claim
26 words
A device as claimed in claim 1, the screw thread extending out of said cavity whereby rotation of the screw varies the length of the duct.
Claim 4
Dependent Claim
57 words
A device as claimed in claim 1, there being a passage in the body intermediate the ends of the screw thread, said duct extending on only one side of said passage, the screw thread on the other side of the passagE mating with the body to prevent flow of fluid on the other side of the passage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |