US3312992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-releasing hopper lock
Assignee: Elgin Sweeper Co
•
Filing: 1964-06-29
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Granted: 1967-04-11
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Expires: 1984-06-29
Abstract
No abstract record available.
Inventors
- 👤 Robert F Schmidt
- 👤 Henry A Leidecker
- 👤 Donald G Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:55
CPC Classifications
E; E01; E01H; E01H1/00; E01H1/02; E01H1/04; E01H1/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A STREET SWEEPER COMPRISING, A BODY, A DIRT HOPPER PROVIDED WITH A SWEEPINGS INLET AND A DISCHARGE OUTLET ADJACENT THERETO, MEANS FOR DIRECTING SWEEPINGS INTO SAID SWEEPINGS INLET, ARM MEANS JOINING SAID DIRT HOPPER WITH SAID BODY, MEANS FOR ELEVATING SAID DIRT HOPPER, A DUMP DOOR SWINGABLY MOUNTED ON SAID DIRT HOPPER, SELF RELEASABLE LATCH MEANS JOINING SAID DOOR WITH SAID HOPPER, AND MEANS FOR TURNING SAID DIRT HOPPER OVER AND OUTWARDLY BEYOND SAID ARM MEANS TO PLACE THE DIRT HOPPER IN AN UNLOADING POSITION AND THEREBY OPERATING THE RELEASABLE LATCH MEANS ALLOWING MOVEMENT OF THE DUMP DOOR TO DISCHARGE THE CONTENTS OF SAID HOPPER.
Claim 2
Dependent Claim
105 words
A STREET SWEEPER COMPRISING, A BODY, A DIRT HOPPER PROVIDED WITH A SWEEPINGS INLET AND A DISCHARGE OUTLET ADJACENT THERETO, MEANS FOR DIRECTING SWEEPINGS INTO SAID SWEEPINGS INLET, ARM MEANS JOINING SAID DIRT HOPPER WITH SAID BODY, MEANS FOR ELEVATING SAID DIRT HOPPER, A DUMP DOOR SWINGABLY MOUNTED ON SAID DIRT HOPPER, SELF RELEASABLE LATCH MEANS JOINING SAID DOOR WITH SAID HOPPER, AND MEANS FOR TURNING SAID DIRT HOPPER OVER AND OUTWARDLY BEYOND SAID ARM MEANS TO PLACE THE DIRT HOPPER IN AN UNLOADING POSITION AND THEREBY OPERATING THE RELEASABLE LATCH MEANS ALLOWING MOVEMENT OF THE DUMP DOOR TO DISCHARGE THE CONTENTS OF SAID HOPPER.
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) | 1970-04-10 | 1970-10-10 | 1971-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-10 | 1974-10-10 | 1975-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-10 | 1978-10-10 | 1979-04-11 | $7700.00 | Window Closed / Lapsed |