Patent JPS551491A successfully refreshed from Google Patents.
US3302979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hopper structure
Assignee: ACF Industries Inc
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Filing: 1964-03-03
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Granted: 1967-02-07
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Expires: 1984-03-03
Abstract
No abstract record available.
Inventors
- 👤 Dallas W Rollins
- 👤 Willard E Kemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:11
CPC Classifications
B; B60; B60P; B60P1/00; B60P1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A BOTTOM OUTLET STRUCTURE ADAPTED TO BE SECURED BENEATH AN OPENING IN THE BOTTOM OF A HOPPER TO RECEIVE AND EFFECT PNEUMATIC DISCHARGE OF MATERIAL FROM THE HOPPER THROUGH THE OPENING, SAID BOTTOM OUTLET STRUCTURE COMPRISING A GENERALLY OVAL, PAN-SHAPED HOUSING FUNNELING DOWNWARDLY TO A BOTTOM DISCHARGE OPENING AND ADAPTED TO COMMUNICATE WITH THE OPENING IN THE BOTTOM OF THE HOPPER FOR RECEIVING MATERIAL THEREFROM, A GAS PERMEABLE MEMBER FITTED WITHIN THE HOUSING AND BEING GENERALLY FUNNEL-SHAPED TO PROVIDE INNER SURFACES CONVERGING FROM THE OPENING IN THE HOPPER, SAID GAS PERMEABLE MEMBER BEING SPACED INWARDLY FROM THE HOUSING TO FORM A PLENUM CHAMBER EXTENDING CIRCUMFERENTIALLY BETWEEN THE HOUSING AND THE GAS PERMEABLE MEMBER AND ADAPTED TO COMMUNICATE WITH A SOURCE OF GAS FOR SUPPLYING GAS UNDER PRESSURE TO THE PLENUM CHAMBER, SAID GAS PERMEABLE MEMBER COMPRISING A GAS PERMEABLE MEMBRANE ON THE UPPER SIDE THEREOF AND A GENERALLY RIGID BASE ON THE LOWER SIDE THEREOF HAVING A PLURALITY OF APERTURES THERETHROUGH, A CIRCUMFERENTIAL WALL
Claim 2
Dependent Claim
164 words
A BOTTOM OUTLET STRUCTURE ADAPTED TO BE SECURED BENEATH AN OPENING IN THE BOTTOM OF A HOPPER TO RECEIVE AND EFFECT PNEUMATIC DISCHARGE OF MATERIAL FROM THE HOPPER THROUGH THE OPENING, SAID BOTTOM OUTLET STRUCTURE COMPRISING A GENERALLY OVAL, PAN-SHAPED HOUSING FUNNELING DOWNWARDLY TO A BOTTOM DISCHARGE OPENING AND ADAPTED TO COMMUNICATE WITH THE OPENING IN THE BOTTOM OF THE HOPPER FOR RECEIVING MATERIAL THEREFROM, A GAS PERMEABLE MEMBER FITTED WITHIN THE HOUSING AND BEING GENERALLY FUNNEL-SHAPED TO PROVIDE INNER SURFACES CONVERGING FROM THE OPENING IN THE HOPPER, SAID GAS PERMEABLE MEMBER BEING SPACED INWARDLY FROM THE HOUSING TO FORM A PLENUM CHAMBER EXTENDING CIRCUMFERENTIALLY BETWEEN THE HOUSING AND THE GAS PERMEABLE MEMBER AND ADAPTED TO COMMUNICATE WITH A SOURCE OF GAS FOR SUPPLYING GAS UNDER PRESSURE TO THE PLENUM CHAMBER, SAID GAS PERMEABLE MEMBER COMPRISING A GAS PERMEABLE MEMBRANE ON THE UPPER SIDE THEREOF AND A GENERALLY RIGID BASE ON THE LOWER SIDE THEREOF HAVING A PLURALITY OF APERTURES THERETHROUGH, A CIRCUMFERENTIAL WALL
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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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |