US3000276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Construction of concrete rafts, roads, aircraft runways and the like
Assignee: British Cellophane Ltd
•
Filing: 1957-12-30
•
Granted: 1961-09-19
•
Expires: 1977-12-30
Abstract
No abstract record available.
Inventors
- 👤 Foulger Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:03
CPC Classifications
E; E01; E01C; E01C7/00; E01C7/08; E01C7/10; E01C7/14; E01C7/145
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
IN AN ARTICLE OF MANUFACTURE COMPRISING A CONCRETE SLAB AND A BASE SUPPORTING SAID SLAB, IN WHICH THE EFFECTIVE COEFFICIENT OF FRICTION BETWEEN THE SLAB AND THE BASE IS SUBSTANTIALLY REDUCED, THE IMPROVEMENT COMPRISING A SHEET ASSEMBLY OF AT LEAST TWO SHEETS OF POLYETHYLENE EACH HAVING A SLIP AGENT INCORPORATED THEREIN TO ATTAIN A COEFFICIENT OF FRICTION BETWEEN AT LEAST TWO OF THE ADJACENT SHEETS OF LESS THAN 0.25, SAID SHEET ASSEMBLY RESTING ON AND COVERING SAID BASE, AND SAID SLAB RESTING ON SAID SHEET ASSEMBLY, THE SAID POLYETHYLENE SHEET ASSEMBLY CONSISTING OF A LENGTH OF FLATTENED TUBING.
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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |