Patent US3288285A successfully refreshed from Google Patents.
US3288285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air classifier
Assignee: General Mills Inc
•
Filing: 1963-07-09
•
Granted: 1966-11-29
•
Expires: 1983-07-09
Abstract
No abstract record available.
Inventors
- 👤 Charles E Walker
- 👤 Charles E Lapple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:56
CPC Classifications
B; B07; B07B; B07B7/00; B07B7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
256 words
AN APPARATUS TO CLASSIFY BY USE OF A FLUID MEDIUM FINELY DIVIDED MATERIAL SUCH AS FLOUR INTO A COARSE AND A FINE FRACTION, SAID CLASSIFIER INCLUDING A CHAMBER HAVING A SEPARATION AREA THEREIN, A PRIMARY CONDUIT ARRANGED TO PNEUMATICALLY CONVEY MATERIAL TO BE CLASSIFIED AND LEADING IN A FIRST PREDETERMINED DIRECTION TO SAID SEPARATION AREA, A FINE FRACTION CONDUIT LEAADING FROM SEPARATION AREAS ALONG A SECOND PREDETERMINED DIRECTION, MEANS FOR POSTIONING SAID PRIMARY CONDUIT AND SAID FINE FRACTION CONDUITRELATIVE TO EACH OTHER SO THAT A FIRST ROW PATH IS DEFINED PASSING FROM SAID PRIMARY CONDUIT THROUGH SAID SEPARATION AREA INTO SAID FINE FRACTION CONDUIT, SAID FIRST FLOW PAWTH BEING CAUSED TO BEND IN SAID SEPARATION AREA IN A PREDETERMINED DIRECTION OF BEND AND WITH A PREDTERMINED DEGREE OF CURVATURE AS IT PASSES FROM SAID PRIMARY CONDUIT TO THE FINE FRACTION CONDUIT, A COARSE FRACTION CONDUIT LEADING FROM SAID SEPARATION AREA, MEANS FOR POSITIONING SAID COARSE FRACTION CONDUIT RELATIVE TO SAID PRIMARY CONDUIT SO THAT A SECOND FLOW PATH IS DEFINED PASSING THROUGH SAID SEPARATION AREA FROM THE PRIMARY CONDUIT TO SAID COARSE FRACTION CONDUIT, SAID SECOND FLOW PATH HAVING A DEGREE OF CURVATURE LESS THAN SAID FIRST FLOW PATH, SECONDARY INLET MEANS LEADING TO SAID SEPARATION AREA, MEANS FOR POSITIONING SAID SECONDARY INLET MEANS AND SAID FINE FRACTION CONDUIT RELATIVE TO EACH OTHER SO THAT A THIRD FLOW PATH IS DEFINED PASSING THROUGH SAID SECOND FLOW PATH, FLUID ACTUATING AND CONTROL MEANS TO CAUSE PRESSURE DIFFERENTIALS IN SAID APPARATUS SO THAT SAID MEDIUM FLOWS FROM SAID
Claim 2
Independent Claim
256 words
AN APPARATUS TO CLASSIFY BY USE OF A FLUID MEDIUM FINELY DIVIDED MATERIAL SUCH AS FLOUR INTO A COARSE AND A FINE FRACTION, SAID CLASSIFIER INCLUDING A CHAMBER HAVING A SEPARATION AREA THEREIN, A PRIMARY CONDUIT ARRANGED TO PNEUMATICALLY CONVEY MATERIAL TO BE CLASSIFIED AND LEADING IN A FIRST PREDETERMINED DIRECTION TO SAID SEPARATION AREA, A FINE FRACTION CONDUIT LEAADING FROM SEPARATION AREAS ALONG A SECOND PREDETERMINED DIRECTION, MEANS FOR POSTIONING SAID PRIMARY CONDUIT AND SAID FINE FRACTION CONDUITRELATIVE TO EACH OTHER SO THAT A FIRST ROW PATH IS DEFINED PASSING FROM SAID PRIMARY CONDUIT THROUGH SAID SEPARATION AREA INTO SAID FINE FRACTION CONDUIT, SAID FIRST FLOW PAWTH BEING CAUSED TO BEND IN SAID SEPARATION AREA IN A PREDETERMINED DIRECTION OF BEND AND WITH A PREDTERMINED DEGREE OF CURVATURE AS IT PASSES FROM SAID PRIMARY CONDUIT TO THE FINE FRACTION CONDUIT, A COARSE FRACTION CONDUIT LEADING FROM SAID SEPARATION AREA, MEANS FOR POSITIONING SAID COARSE FRACTION CONDUIT RELATIVE TO SAID PRIMARY CONDUIT SO THAT A SECOND FLOW PATH IS DEFINED PASSING THROUGH SAID SEPARATION AREA FROM THE PRIMARY CONDUIT TO SAID COARSE FRACTION CONDUIT, SAID SECOND FLOW PATH HAVING A DEGREE OF CURVATURE LESS THAN SAID FIRST FLOW PATH, SECONDARY INLET MEANS LEADING TO SAID SEPARATION AREA, MEANS FOR POSITIONING SAID SECONDARY INLET MEANS AND SAID FINE FRACTION CONDUIT RELATIVE TO EACH OTHER SO THAT A THIRD FLOW PATH IS DEFINED PASSING THROUGH SAID SECOND FLOW PATH, FLUID ACTUATING AND CONTROL MEANS TO CAUSE PRESSURE DIFFERENTIALS IN SAID APPARATUS SO THAT SAID MEDIUM FLOWS FROM SAID
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |