US3168235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicoidal fans
Assignee: Howden Solyvent Ventec SAS
•
Filing: 1960-12-30
•
Granted: 1965-02-02
•
Expires: 1980-12-30
Abstract
No abstract record available.
Inventors
- 👤 Valdi Rene Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:25
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/38; F04D29/384
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
AN AXIAL FAN OF THE TYPE DESCRIBED COMPRISING AT LEAST TWO BLADES MOUNTED ON A HUB, IN WHICH THE MAXIMUM THICKNESS OF THE TRANSVERSE SECTION OF EACH BLADE INCREASES FROM THE BASE TO THE EXTREMITY OF SAID BLADE, THE NUMBER N OF BLADES AND THE MAXIMUM THICKNESS L OF SAID BLADES, FOR A TRANSVERSE SECTION TAKEN AT A DISTANCE R FROM THE AXIS OF THE HUB, BEING SUCH THAT THE RELATION NL/2$R$0.08 IS SATISFIED IN THE CASE OF AT LEAST ONE TRANSVERSE SECTION, AND AN OUTER CASING COAXIALLY SURROUNDING THE EXTREMITY OF SAID BLADES THE CHORD OF THE BLADE HAVING AN INCREASE IN LENGTH AT ANY GIVEN TRANSVERSE SECTION THERETHROUGH FROM THE BASE TO THE EXTREMITY OF THE BLADE.
Claim 2
Dependent Claim
119 words
AN AXIAL FAN OF THE TYPE DESCRIBED COMPRISING AT LEAST TWO BLADES MOUNTED ON A HUB, IN WHICH THE MAXIMUM THICKNESS OF THE TRANSVERSE SECTION OF EACH BLADE INCREASES FROM THE BASE TO THE EXTREMITY OF SAID BLADE, THE NUMBER N OF BLADES AND THE MAXIMUM THICKNESS L OF SAID BLADES, FOR A TRANSVERSE SECTION TAKEN AT A DISTANCE R FROM THE AXIS OF THE HUB, BEING SUCH THAT THE RELATION NL/2$R$0.08 IS SATISFIED IN THE CASE OF AT LEAST ONE TRANSVERSE SECTION, AND AN OUTER CASING COAXIALLY SURROUNDING THE EXTREMITY OF SAID BLADES THE CHORD OF THE BLADE HAVING AN INCREASE IN LENGTH AT ANY GIVEN TRANSVERSE SECTION THERETHROUGH FROM THE BASE TO THE EXTREMITY OF THE BLADE.
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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) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |