Patent US2009571A successfully refreshed from Google Patents.
Patent US3797528A successfully refreshed from Google Patents.
US3797528A
Expired / Lapsed
US
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Variable flow fluidic transducer
Assignee: Danfoss Power Solutions Inc
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Filing: 1972-02-07
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Granted: 1974-03-19
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Expires: 1992-02-07
Abstract
Abstract A variable resistance fluidic transducer having a housing forming a generally cylindrical chamber, a spool positioned within the chamber, a circumferencial channel formed in the spool, an input port through said housing for supplying fluid to a metering slot formed in the spool, the metering slot cooperating with the channel, and a pair of outlet ports through said housing and cooperating with said channel for receiving the fluid and providing a differential output.
Inventors
- 👤 A Beckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:27
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/072
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
A variable resistance fluidic transducer comprising: a housing defining a generally cylindrical chamber; a rotatable spool located within said chamber and having a metering slot formed therein, said spool further having a substantially coplanar channel circumferentially formed around at least a portion of said spool for cooperating with said slot; fluid supply means for supplying fluid through said housing to said slot and thus to said channel; and outlet means cooperating with said channel for receiving fluid from said channel whereby said resistance is determined by the length of said channel between said slot and said outlet means.
Claim 2
Dependent Claim
98 words
A variable resistance fluidic transducer comprising: a housing defining a generally cylindrical chamber; a rotatable spool located within said chamber and having a metering slot formed therein, said spool further having a substantially coplanar channel circumferentially formed around at least a portion of said spool for cooperating with said slot; fluid supply means for supplying fluid through said housing to said slot and thus to said channel; and outlet means cooperating with said channel for receiving fluid from said channel whereby said resistance is determined by the length of said channel between said slot and said outlet means.
Claim 3
Dependent Claim
59 words
The variable resistance fluidic transducer of claim 1 wherein said outlet means comprises two substantially diametrically opposed ports whereby, upon rotation of said rotatable spool, the length of the channel between the input port and one of said outlet ports increases whereas the length of the channel between the input port and the other of said outlet ports decreases.
Claim 4
Dependent Claim
17 words
The variable resistance fluidic transducer of claim 1 wherein said channel means extends completely around said spool.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |