US3732020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preformed surfacing for pavements
Assignee: SECRETARY FOR ENVIRONMENT
•
Filing: 1971-02-04
•
Granted: 1973-05-08
•
Expires: 1991-02-04
Abstract
Abstract A preformed surfacing for a pavement is in the form of a sheet of flexible material containing cavities open to its upper surface and interconnected by ducts beneath the surface so that when laid down on a prepared subsurface having a drainage slope, water falling on the surfacing can drain away through the cavities and ducts. The sheet can be fixed to the subsurface by anchors bonded into cavities in the sheet.
Inventors
- 👤 R Judge
- 👤 F Martin
- 👤 R Mozley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:20
CPC Classifications
E; E01; E01C; E01C5/00; E01C5/20; E01C11/00; E01C11/22; E01C11/224; E01C11/225; E01C2201/00; E01C2201/20; E01C2201/202; E01C2201/207; Y; Y02; Y02A; Y02A30/00; Y02A30/60
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
150 words
A preformed surfacing for a pavement suitable for an aircraft runway surface comprising a sheet of flexible material laid down on a prepared subsurface having a drainage slope, said sheet having a plurality of cavities therein each of which is open to an uppermost surface of the sheet and is surrounded by substantially continuous walls extending from the uppermost to the lowermost surface of the sheet and having ducts extending through said walls providing communication between adjacent cavities, the portions of said substantially continuous walls above the ducts preventing the flow of liquid from the uppermost surface of the sheet into said ducts other than via said cavities, there being ducts from each cavity to at least three adjacent cavities so that in use liquid collecting in the cavities can be drawn away from the sheet through the ducts down the direction of the drainage slope of the prepared subsurface.
Claim 2
Dependent Claim
150 words
A preformed surfacing for a pavement suitable for an aircraft runway surface comprising a sheet of flexible material laid down on a prepared subsurface having a drainage slope, said sheet having a plurality of cavities therein each of which is open to an uppermost surface of the sheet and is surrounded by substantially continuous walls extending from the uppermost to the lowermost surface of the sheet and having ducts extending through said walls providing communication between adjacent cavities, the portions of said substantially continuous walls above the ducts preventing the flow of liquid from the uppermost surface of the sheet into said ducts other than via said cavities, there being ducts from each cavity to at least three adjacent cavities so that in use liquid collecting in the cavities can be drawn away from the sheet through the ducts down the direction of the drainage slope of the prepared subsurface.
Claim 3
Dependent Claim
32 words
A preformed surfacing for a pavement according to claim 1 in which at least some of said cavities are through cavities interconnecting the uppermost surface to a lowermost surface of said sheet.
Claim 4
Dependent Claim
25 words
A preformed surfacing for a pavement according to claim 2 in which said interconnecting ducts are channels formed in the lowermost surface of the sheet.
Claim 5
Dependent Claim
33 words
A preformed surfacing for a pavement according to claim 1 in which said sheet is provided with a plurality of anchors spaced at discrete intervals whereby it can be fixed to the subsurface.
Claim 6
Dependent Claim
25 words
A preformed surfacing for a pavement according to claim 4 in which each anchor is located in one of said drainage cavities in the sheet.
Claim 7
Dependent Claim
30 words
A preformed surfacing for a pavement according to claim 4 in which each of said anchors comprises a membercemented into a recess in said subsurface and bonded into said sheet.
Claim 8
Dependent Claim
34 words
A preformed surfacing for a pavement according to claim 4 in which each anchor comprises a plug of castable, bonding material filling arecess in said subsurface and a corresponding adjacent cavity in the sheet.
Claim 9
Dependent Claim
36 words
A preformed surfacing for a pavement according to claim 1 in which said cavities extend through only part of said sheet, the lower surface of which presents a continuous impervious face in contact with said subsurface.
Claim 10
Dependent Claim
25 words
A preformed surfacing for a pavement according to claim 8 which is fixed to said subsurface by adhesion between said lower surface and the subsurface.
Claim 11
Dependent Claim
24 words
A preformed surfacing for a pavement according to claim 1 in which said cavities are of uniform size and regularly spaced from each other.
Claim 12
Dependent Claim
46 words
A preforming surfacing for a pavement according to claim 10 in which each cavity is surrounded by six cavities, equispaced around said cavity and each equidistant from said cavity, each cavity having six ducts, each of which ducts is connected on one of said surrounding cavities.
Claim 13
Dependent Claim
29 words
A preformed surfacing for a pavement according to claim 10 in which each cavity is substantially circular in cross-section in planes parallel to the uppermost surface of the sheet.
Claim 14
Dependent Claim
29 words
A preformed surfacing for a pavement according to claim 10 in which each cavity is substantially hexagonal in cross-section in planes parallel to the uppermost surface of the sheet.
References Cited (Backward Citations)
US511870A
Cited
US619934A
Cited
US2057738A
Cited
US2023307A
Cited
US2999431A
Cited
US3040637A
Cited
US3438312A
Cited
US3407713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |