US3570253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constructional works
Assignee: Individual
•
Filing: 1969-01-13
•
Granted: 1971-03-16
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Expires: 1989-01-13
Abstract
Abstract CLADDING FOR A MASS OF PARTICLES THAT ARE BOUND TOGETHER SOLELY BY FRICTION. THE CLADDING IS PREFERABLY IN THE SHAPE OF ELONGATED CHANNEL MEMBERS WHICH HAVE OPPOSED SIDE WALLS AND A CURVED FRONT WALL. THE CURVATURE OF THE FRONT WALL IS SEMI-ELLIPTICAL. THE SIDE WALLS OF ADJACENT CHANNEL MEMBERS ARE SUPERIMPOSED ON EACH OTHER AND THE PARTICLES AND CHANNELS MEMBES ARE RETAINED BY FRICTION.
Inventors
- 👤 Henri C Vidal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:26
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/02; E02D29/0225; E02D29/0241
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |