Patent US3220638A successfully refreshed from Google Patents.
US3220638A
Expired / Lapsed
US
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Suction unit, particularly for cleaning apparatus
Assignee: Fisker and Nielsen AS
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Filing: 1964-08-21
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Granted: 1965-11-30
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Expires: 1984-08-21
Abstract
No abstract record available.
Inventors
- 👤 Petersen Georg Vilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:02
CPC Classifications
A; A47; A47L; A47L7/00; A47L7/0004; A47L7/0019; A47L5/00; A47L5/12; A47L5/22; A47L7/0042; H; H02; H02K; H02K9/00; H02K9/02; H02K9/04; H02K9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A SUCTION UNIT, PARTICULARLY FOR SUCTION CLEANING APPARATUS, COMPRISING A HOUSING, AN ELECTRIC MOTOR LOCATED WITHIN SAID HOUSING AND HAVING A STATOR AND A ROTARY SHAFT, FAN MEANS SECURED TO SAID MOTOR SHAFT, TWO STATIONARY ANNULAR PLATES LOCATED IN SAID HOUSING INTERMEDIATE SAID FAN MEANS AND SAID MOTOR STATOR COAXIALLY WITH SAID SHAFT, SAID ANNULAR PLATES BEING SHAPED SO AS TO DEFINE BETWEEN THEM AN ANNULAR DIFFUSER, A CIRCULAR DISC SECURED TO SAID MOTOR SHAFT INTERMEDIATE SAID ANNULAR STATIONARY PLATES AND EXTENDING OUTWARDLY PAST THE INNER EDGE OF THE PLATE ADJACENT SAID FAN MEANS WITH AN OUTWARDLY DECREASING INTERSPACING FROM SAID PLATE TO DEFINE THEREWITH AN ANNULAR NOZZLE, A FIRST AIR INLET CONNECTED TO THE SUCTION SIDE OF SAID FAN MEANS, A SECOND AIR INLET CONNECTED TO THE SPACE SUROUNDING SAID MOTOR STATOR, AND AN AIR OUTLET CONNECTED TO THE DISCHARGE END OF SAID ANNULAR DIFFUSER.
Claim 2
Dependent Claim
146 words
A SUCTION UNIT, PARTICULARLY FOR SUCTION CLEANING APPARATUS, COMPRISING A HOUSING, AN ELECTRIC MOTOR LOCATED WITHIN SAID HOUSING AND HAVING A STATOR AND A ROTARY SHAFT, FAN MEANS SECURED TO SAID MOTOR SHAFT, TWO STATIONARY ANNULAR PLATES LOCATED IN SAID HOUSING INTERMEDIATE SAID FAN MEANS AND SAID MOTOR STATOR COAXIALLY WITH SAID SHAFT, SAID ANNULAR PLATES BEING SHAPED SO AS TO DEFINE BETWEEN THEM AN ANNULAR DIFFUSER, A CIRCULAR DISC SECURED TO SAID MOTOR SHAFT INTERMEDIATE SAID ANNULAR STATIONARY PLATES AND EXTENDING OUTWARDLY PAST THE INNER EDGE OF THE PLATE ADJACENT SAID FAN MEANS WITH AN OUTWARDLY DECREASING INTERSPACING FROM SAID PLATE TO DEFINE THEREWITH AN ANNULAR NOZZLE, A FIRST AIR INLET CONNECTED TO THE SUCTION SIDE OF SAID FAN MEANS, A SECOND AIR INLET CONNECTED TO THE SPACE SUROUNDING SAID MOTOR STATOR, AND AN AIR OUTLET CONNECTED TO THE DISCHARGE END OF SAID ANNULAR DIFFUSER.
References Cited (Backward Citations)
US2534808A
Cited
US2726807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |