US3228344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal impeller and method of making same
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1963-08-30
•
Granted: 1966-01-11
•
Expires: 1983-08-30
Abstract
No abstract record available.
Inventors
- 👤 Cooper Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:08
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2261; F04D31/00; Y; Y10; Y10S; Y10S415/00; Y10S415/914; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49329
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A CENTRIFUGAL IMPELLER HAVING A HUB ESTABLISHING AN AXIS OF ROTATION AND A RADIAL FRONT FACE, A VANE SYSTEM ON SAID FRONT FACE COMPRISING PLURAL CIRCUMFERENTIALLY SPACED SPRIALLY WRAPPED VANES, ALTERNATE FIRST VANES STARTING RADIALLY INWARDLY AND EXTENDING RADIALLY OUTWARDLY THROUGH A SPIRAL WRAP OF SUBSTANTIALLY 360*, ALTERNATE SECOND VANES STARTING RADIALLY INWARDLY AND EXTENDING RADIALLY OUTWARDLY THROUGH A SPIRAL WRAP OF MORE THAN 180* BUT LESS THAN 360*. THEREBY TO FORM LONG, NARROW PASSAGES.
Claim 2
Dependent Claim
75 words
A CENTRIFUGAL IMPELLER HAVING A HUB ESTABLISHING AN AXIS OF ROTATION AND A RADIAL FRONT FACE, A VANE SYSTEM ON SAID FRONT FACE COMPRISING PLURAL CIRCUMFERENTIALLY SPACED SPRIALLY WRAPPED VANES, ALTERNATE FIRST VANES STARTING RADIALLY INWARDLY AND EXTENDING RADIALLY OUTWARDLY THROUGH A SPIRAL WRAP OF SUBSTANTIALLY 360*, ALTERNATE SECOND VANES STARTING RADIALLY INWARDLY AND EXTENDING RADIALLY OUTWARDLY THROUGH A SPIRAL WRAP OF MORE THAN 180* BUT LESS THAN 360*. THEREBY TO FORM LONG, NARROW PASSAGES.
References Cited (Backward Citations)
DE23234C
Cited
US45398A
Cited
US1622930A
Cited
US1586160A
Cited
US1937461A
Cited
GB496820A
Cited
US2353871A
Cited
US2753808A
Cited
GB694637A
Cited
FR1293656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |