US4619438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve
Assignee: Imperial Chemical Industries Ltd
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Filing: 1980-08-19
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Granted: 1986-10-28
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Expires: 2000-08-19
Abstract
Abstract A valve comprises a port for the passage of fluid, a plug for interrupting the flow of fluid through the port mechanically biased into a closed position, and means for creating an electrostatic field for causing the plug to move relative to the port so as to open the valve.
Inventors
- 👤 Ronald A. Coffee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:42
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
150 words
A valve comprising: means defining a port for the passage of fluid; an electrostatically neutral plug for interrupting the flow of fluid through the port; means for mechanically biasing said plug into a position closing the port, seating on said means defining the port, said means defining said port comprising a first metal plate having a port formed thereon, and said plug comprising a second metal plate, insulated from said first metal plate, and having a boss upstanding from one face of said second metal plate and dimensioned to be received within the port; and means for applying a high electrostatic potential of the same sign to both said plug and said means defining the port, so that an electrostatic field between said plug and said means defining the port sufficient to cause said plug to move away from and open the port, and allow fluid passage therethrough, is provided.
Claim 2
Dependent Claim
150 words
A valve comprising: means defining a port for the passage of fluid; an electrostatically neutral plug for interrupting the flow of fluid through the port; means for mechanically biasing said plug into a position closing the port, seating on said means defining the port, said means defining said port comprising a first metal plate having a port formed thereon, and said plug comprising a second metal plate, insulated from said first metal plate, and having a boss upstanding from one face of said second metal plate and dimensioned to be received within the port; and means for applying a high electrostatic potential of the same sign to both said plug and said means defining the port, so that an electrostatic field between said plug and said means defining the port sufficient to cause said plug to move away from and open the port, and allow fluid passage therethrough, is provided.
Claim 3
Dependent Claim
42 words
A valve as recited in claim 1 wherein said mechanical biasing means comprises a spring engaging a face of said second metal plate opposite said face from which said boss extends, and biasing said boss so that it passes into the port.
Claim 4
Dependent Claim
38 words
A valve as recited in claims 1 or 2 wherein said second metal plate is circular and has a plurality of peripheral slots formed therein through which fluid can flow from the port when the port is open.
Claim 5
Dependent Claim
20 words
A valve as recited in claim 3 wherein the port is circular and wherein said boss is circular in cross-section.
References Cited (Backward Citations)
CA599652A
Cited
GB825548A
Cited
US3405728A
Cited
US3416549A
Cited
US3587613A
Cited
SU465513A1
Cited
SU482568A1
Cited
FR2294535A1
Cited
US4005733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |