US3333762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffuser for centrifugal compressor
Assignee: Pratt and Whitney Canada Corp
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Filing: 1966-11-16
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Granted: 1967-08-01
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Expires: 1986-11-16
Abstract
No abstract record available.
Inventors
- 👤 John C Vrana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:35
CPC Classifications
F; F04; F04D; F04D21/00; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/441
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN A CENTRIFUGAL COMPRESSOR OF THE TYPE HAVING A ROTARY IMPELLER, A DIFFUSER COMPRISING AN ANNULAR MEMBER HAVING AN INNER CIRCUMFERENCE CLOSELY SURROUNDING THE IMPELLER, A PLURALITY OF INTERSECTING PASSAGES IN SAID ANNULAR MEMBER EXTENDING OUTWARDLY FROM SAID INNER CIRCUMFERENCE, EACH OF SAID PASSAGE BEING SUBSTANTIALLY STRAIGHT FROM THE INNER END OF THE PASSAGE TO A POINT DOWNSTREAM OF ITS INTERSECTION WITH ADJACENT PASSAGES, SAID PASSAGES BEING CURVILINEAR IN TRANSVERSE SECTION, THE CENTER LINES OF THE SUBSTANTIALLY STRAIGHT PORTIONS OF SAID PASSGES BEING TANGENT TO A COMMON TANGENCY CIRCUIT HAVING APPROXIMATELY THE SAME DIAMETER AS THE IMPELLER, SAID CENTER LINES BEING ALSO ADAPTED TO INTERSECT THE CENTER LINES OF ADJACENT PASSAGES AT A DISTANCE OUTWARD FROM SAID COMMON CIRCLE HAVING A LENGTH LESS THAN ONE-HALF THE MAXIMUM TRANSVERSE DIMENSION OF THE PASSAGE MEASURED AT A POINT NEAR THE INTERSECTION OF ADJACENT PASSAGES.
Claim 2
Dependent Claim
142 words
IN A CENTRIFUGAL COMPRESSOR OF THE TYPE HAVING A ROTARY IMPELLER, A DIFFUSER COMPRISING AN ANNULAR MEMBER HAVING AN INNER CIRCUMFERENCE CLOSELY SURROUNDING THE IMPELLER, A PLURALITY OF INTERSECTING PASSAGES IN SAID ANNULAR MEMBER EXTENDING OUTWARDLY FROM SAID INNER CIRCUMFERENCE, EACH OF SAID PASSAGE BEING SUBSTANTIALLY STRAIGHT FROM THE INNER END OF THE PASSAGE TO A POINT DOWNSTREAM OF ITS INTERSECTION WITH ADJACENT PASSAGES, SAID PASSAGES BEING CURVILINEAR IN TRANSVERSE SECTION, THE CENTER LINES OF THE SUBSTANTIALLY STRAIGHT PORTIONS OF SAID PASSGES BEING TANGENT TO A COMMON TANGENCY CIRCUIT HAVING APPROXIMATELY THE SAME DIAMETER AS THE IMPELLER, SAID CENTER LINES BEING ALSO ADAPTED TO INTERSECT THE CENTER LINES OF ADJACENT PASSAGES AT A DISTANCE OUTWARD FROM SAID COMMON CIRCLE HAVING A LENGTH LESS THAN ONE-HALF THE MAXIMUM TRANSVERSE DIMENSION OF THE PASSAGE MEASURED AT A POINT NEAR THE INTERSECTION OF ADJACENT PASSAGES.
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) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |