Patent US1868165A successfully refreshed from Google Patents.
Patent US3173381A successfully refreshed from Google Patents.
US3173381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway hopper car
Assignee: ACF Industries Inc
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Filing: 1963-06-24
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Granted: 1965-03-16
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Expires: 1983-06-24
Abstract
No abstract record available.
Inventors
- 👤 Charles Asa Franklin
- 👤 Willard E Kemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:53
CPC Classifications
B; B61; B61D; B61D7/00; B61D7/14; B61D7/16; B61D7/24; B61D7/26; B61D7/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
IN A RAILWAY HOPPER CAR HAVING A BOTTOM DISCHARGE OPENING FOR UNLOADING LADING FROM THE CAR, A PAIR OF DOORS PIVOTALLY MOUNTED ABOUT TWO GENERALLY HORIZONTAL SPACED AXES PARALLEL TO THE LONGITUDINAL AXIS OF THE CAR AND ADAPTED TO SWING TRANSVERSELY OF THE CAR BETWEEN OPEN AND CLOSED POSITIONS RELATIVE TO THE OPENING, THE DOORS BEING PIVOTALLY SUSPENDED TO SWING BY GRAVITY TOWARD CLOSED POSITION AFTER BEING OPENED, A SEPARATE LINK PIVOTALLY CONNECTED TO EACH DOOR, A CRANKSHAFT MOUNTED FOR ROTAION ABOUT AN AXIS PARALLEL TO THE LONGITUDINAL AXIS OF THE CAR AND HAVING A PLURALITY OF CRANK ARMS SECURED THERETO FOR ROTATIVE MOVEMENT, A SEPARATE CRANK ARM BEING PIVOTALLY CONNECTED TO EACH LINK FOR SWINGING THE DOORS OPEN AND CLOSED, AND FLUID PRESSURE MEANS PIVOTALLY CONNECTED TO SAID CRANKSHAFT FOR ROTATING THE CRANKSHAFT FIRST IN ONE DIRECTION FOR OPENING THE DOORS AND THEN IN THE OPPOSITE DIRECTION FOR LOCKING THE DOORS IN CLOSED POSITION.
Claim 2
Dependent Claim
155 words
IN A RAILWAY HOPPER CAR HAVING A BOTTOM DISCHARGE OPENING FOR UNLOADING LADING FROM THE CAR, A PAIR OF DOORS PIVOTALLY MOUNTED ABOUT TWO GENERALLY HORIZONTAL SPACED AXES PARALLEL TO THE LONGITUDINAL AXIS OF THE CAR AND ADAPTED TO SWING TRANSVERSELY OF THE CAR BETWEEN OPEN AND CLOSED POSITIONS RELATIVE TO THE OPENING, THE DOORS BEING PIVOTALLY SUSPENDED TO SWING BY GRAVITY TOWARD CLOSED POSITION AFTER BEING OPENED, A SEPARATE LINK PIVOTALLY CONNECTED TO EACH DOOR, A CRANKSHAFT MOUNTED FOR ROTAION ABOUT AN AXIS PARALLEL TO THE LONGITUDINAL AXIS OF THE CAR AND HAVING A PLURALITY OF CRANK ARMS SECURED THERETO FOR ROTATIVE MOVEMENT, A SEPARATE CRANK ARM BEING PIVOTALLY CONNECTED TO EACH LINK FOR SWINGING THE DOORS OPEN AND CLOSED, AND FLUID PRESSURE MEANS PIVOTALLY CONNECTED TO SAID CRANKSHAFT FOR ROTATING THE CRANKSHAFT FIRST IN ONE DIRECTION FOR OPENING THE DOORS AND THEN IN THE OPPOSITE DIRECTION FOR LOCKING THE DOORS IN CLOSED POSITION.
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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) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |