Patent US3305215A successfully refreshed from Google Patents.
US3305215A
Expired / Lapsed
US
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Fluid cushion for hydraulic turbomachinery
Assignee: Allis Chalmers Corp
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Filing: 1966-04-05
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Granted: 1967-02-21
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Expires: 1986-04-05
Abstract
No abstract record available.
Inventors
- 👤 Swiecicki Ignacy
- 👤 Warren G Whippen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:57
CPC Classifications
F; F03; F03B; F03B3/00; F03B3/02; F03B11/00; F03B11/002; Y; Y02; Y02E; Y02E10/00; Y02E10/20; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN HYDRAULIC TURBOMACHINERY INCLUDING WALLS DEFINING A LIQUID PASSAGEWAY THE COMBINATION COMPRISING: A HUB ROTATABLY SUPPORTED IN SAID PASSAGEWAY; A PLURALITY OF CIRCUMFERENTIALLY SPACED BLADES CONNECTED TO SAID HUB FOR ROTATION THEREWITH, SAID BLADES BEING ARRANGED IN SAID LIQUID PASSAGEWAY TO CAUSE ENERGY TRANSFER BETWEEN SAID BLADES AND THE LIQUID; FLUID PASSAGE MEANS INCLUDING A PLURALITY OF LONGITUDINALLY SPACED OPENINGS ON THE LOW PRESSURE SIDE OF THE BLADING LOCATED CLOSELY ADJACENT THE LEADING EDGE OF THE BLADES; AND FLUID CONNECTING MEANS CONNECTING SAID FLUID PASSAGE MEANS IN COMMUNICATION WITH A FLUID SOURCE WHEREBY FLUID FLOWS THROUGH SAID OPENINGS AS THE PRESSURE IN SAID LIQUID PASSAGEWAY ABOUT SAID OPENINGS DECREASES BELOW THE PRESSURE OF SAID FLUID SOURCE.
Claim 2
Dependent Claim
116 words
IN HYDRAULIC TURBOMACHINERY INCLUDING WALLS DEFINING A LIQUID PASSAGEWAY THE COMBINATION COMPRISING: A HUB ROTATABLY SUPPORTED IN SAID PASSAGEWAY; A PLURALITY OF CIRCUMFERENTIALLY SPACED BLADES CONNECTED TO SAID HUB FOR ROTATION THEREWITH, SAID BLADES BEING ARRANGED IN SAID LIQUID PASSAGEWAY TO CAUSE ENERGY TRANSFER BETWEEN SAID BLADES AND THE LIQUID; FLUID PASSAGE MEANS INCLUDING A PLURALITY OF LONGITUDINALLY SPACED OPENINGS ON THE LOW PRESSURE SIDE OF THE BLADING LOCATED CLOSELY ADJACENT THE LEADING EDGE OF THE BLADES; AND FLUID CONNECTING MEANS CONNECTING SAID FLUID PASSAGE MEANS IN COMMUNICATION WITH A FLUID SOURCE WHEREBY FLUID FLOWS THROUGH SAID OPENINGS AS THE PRESSURE IN SAID LIQUID PASSAGEWAY ABOUT SAID OPENINGS DECREASES BELOW THE PRESSURE OF SAID FLUID SOURCE.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |