US3098603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal fan housings
Assignee: American Air Filter Co Inc
•
Filing: 1960-09-26
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Granted: 1963-07-23
•
Expires: 1980-09-26
Abstract
No abstract record available.
Inventors
- 👤 Forrest G Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:04
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/4206; F04D29/4226; F04D29/424
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A CENTRIFUGAL FAN HOUSING, WHICH IS SUBSTANTIALLY SCROLL-SHAPED IN LONGITUDINAL CROSS-SECTION AND IS OF GENERALLY RECTANGULAR-SHAPE IN LATERAL CROSS-SECTION, SAID HOUSING HAVING A CUTOFF, AN END OF SPIRAL, AND AN ISOSCELES TRAPEZOID-SHAPED OUTLET AREA, SAID OUTLET ARES HAVING ONE BOUNDARY DEFINED BY SAID CUTOFF, AND HAVING AN OPPOSITE BOUNDARY WHICH IS DIRECTLY ACROSS SAID OUTLET AREA FROM SAID CUTOFF AND WHICH IS THE LONGER OF THE TWO PARALLEL SIDES OF SAID TRAPEZOID, SAID HOUSING INCLUDING OPPOSITE HOUSING SIDES HAVING GENERALLY TRIANGULAR-SHAPED PORTIONS ADJACENT SAID OUTLET AREA, EACH OF SAID TRIANGULAR-SHAPED PORTIONS INCLUDING A BASE LINE SIDE DEFINED GENERALLY AT OPPOSITE ENDS THEREOF BY SAID CUTOFF AND SAID END OF SPRIAL, EACH OF SAID TRINAGULAR-SHAPED PORTIONS FURTHER INCLUDING
Claim 2
Dependent Claim
117 words
A CENTRIFUGAL FAN HOUSING, WHICH IS SUBSTANTIALLY SCROLL-SHAPED IN LONGITUDINAL CROSS-SECTION AND IS OF GENERALLY RECTANGULAR-SHAPE IN LATERAL CROSS-SECTION, SAID HOUSING HAVING A CUTOFF, AN END OF SPIRAL, AND AN ISOSCELES TRAPEZOID-SHAPED OUTLET AREA, SAID OUTLET ARES HAVING ONE BOUNDARY DEFINED BY SAID CUTOFF, AND HAVING AN OPPOSITE BOUNDARY WHICH IS DIRECTLY ACROSS SAID OUTLET AREA FROM SAID CUTOFF AND WHICH IS THE LONGER OF THE TWO PARALLEL SIDES OF SAID TRAPEZOID, SAID HOUSING INCLUDING OPPOSITE HOUSING SIDES HAVING GENERALLY TRIANGULAR-SHAPED PORTIONS ADJACENT SAID OUTLET AREA, EACH OF SAID TRIANGULAR-SHAPED PORTIONS INCLUDING A BASE LINE SIDE DEFINED GENERALLY AT OPPOSITE ENDS THEREOF BY SAID CUTOFF AND SAID END OF SPRIAL, EACH OF SAID TRINAGULAR-SHAPED PORTIONS FURTHER INCLUDING
References Cited (Backward Citations)
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US2135252A
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US2341871A
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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) | 1966-07-22 | 1967-01-21 | 1967-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-22 | 1971-01-21 | 1971-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-22 | 1975-01-21 | 1975-07-23 | $7700.00 | Window Closed / Lapsed |