Patent US3138268A successfully refreshed from Google Patents.
US3138268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silo unloader wall cleaner
Assignee: Vandale Corp
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Filing: 1961-12-08
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Granted: 1964-06-23
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Expires: 1981-12-08
Abstract
No abstract record available.
Inventors
- 👤 Floyd E Buschbom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:21
CPC Classifications
A; A01; A01F; A01F25/00; A01F25/16; A01F25/20; A01F25/2009
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A WALL CLEANER COMPRISING A HUB, A PLURALITY OF PITCHED BLADES SECURED AT ONE END TO SAID HUB AND EXTENDING RADIALLY THEREFROM, SAID BLADES BEING EVENLY SPACED ABOUT SAID HUB AND EACH INCLUDING LEADING AND TRAILING EDGES, OUTER AND INNER FACES AND A FLANGED TIP SECTION UNITING SAID EDGES, THE INNER FACE OF EACH OF SAID BLADES BEING CONCAVED FOR AT LEAST A PORTION THEREOF ADJACENT TO THE LEADING EDGE AND CONVEXED FOR AT LEAST A PORTION THEREOF ADJACENT THE TRAILING EDGE, SAID FLANGE TIP SECTION PROJECTING INWARDLY THEREBY PROVIDING AN INTERNAL FLANGE SURFACE IN COOPERATION WITH SAID INNER FACE, WHEREBY SAID INNER FACE AND SAID INTERNAL FLANGE SURFACE BEING SO CONTOURED THAT AS THE WALL CLEANER IS ROTATED THE ENSILAGE IS FORCED INWARDLY AWAY FROM SAID WALL AND SAID WALL CLEANER.
Claim 2
Dependent Claim
132 words
A WALL CLEANER COMPRISING A HUB, A PLURALITY OF PITCHED BLADES SECURED AT ONE END TO SAID HUB AND EXTENDING RADIALLY THEREFROM, SAID BLADES BEING EVENLY SPACED ABOUT SAID HUB AND EACH INCLUDING LEADING AND TRAILING EDGES, OUTER AND INNER FACES AND A FLANGED TIP SECTION UNITING SAID EDGES, THE INNER FACE OF EACH OF SAID BLADES BEING CONCAVED FOR AT LEAST A PORTION THEREOF ADJACENT TO THE LEADING EDGE AND CONVEXED FOR AT LEAST A PORTION THEREOF ADJACENT THE TRAILING EDGE, SAID FLANGE TIP SECTION PROJECTING INWARDLY THEREBY PROVIDING AN INTERNAL FLANGE SURFACE IN COOPERATION WITH SAID INNER FACE, WHEREBY SAID INNER FACE AND SAID INTERNAL FLANGE SURFACE BEING SO CONTOURED THAT AS THE WALL CLEANER IS ROTATED THE ENSILAGE IS FORCED INWARDLY AWAY FROM SAID WALL AND SAID WALL CLEANER.
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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |