US3717110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor actuated hopper doors
Assignee: Pullman Standard Inc
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Filing: 1971-07-19
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Granted: 1973-02-20
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Expires: 1991-07-19
Abstract
Abstract A DISCHARGE ARRANGEMENT FOR RAILWAY HOPPER CARS INCLUDES PIVOTED BOTTOM DOORS RELATIVELY MOVABLE WITH RESPECT TO EACH OTHER FOR OPENING AND CLOSING A DISCHARGE OPENING. THE DOORS EACH INCLUDE INNER AND OUTER SECTIONS PIVOTALLY INTERCONNECTED WHICH IN A CLOSED POSITION EXTEND SUBSTANTIALLY LINEARLY AND WHICH DURING OPEN POSITION EXTEND IN RELATIVE ANGULAR RELATION. A FORCE TRANSMITTING MECHANISM IS PROVIDED FOR EACH DOOR, INCLUDING LEVER AND LINKAGE ARRANGEMENTS CONNECTED TO THE INNER AND OUTER SECTIONS, WHICH UPON ACTUATION BY A POWER UNIT MOUNTED ON THE HOPPER CAR MOVE THE DOORS TO THEIR SELECTIVE POSITIONS.
Inventors
- 👤 R Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:00
CPC Classifications
B; B61; B61D; B61D7/00; B61D7/14; B61D7/16; B61D7/24; B61D7/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |