US3732791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pavement and railroad bed construction with light concrete sub-layer
Assignee: BASF SE
•
Filing: 1971-03-04
•
Granted: 1973-05-15
•
Expires: 1991-03-04
Abstract
Abstract Frost barrier for pavements and railroad bed in the form of a layer of light concrete containing particles of organic foam plastics.
Inventors
- 👤 F Hohwiller
- 👤 K Koehling
- 👤 W Schneider
- 👤 D Koenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:14
CPC Classifications
E; E01; E01C; E01C3/00; E01C3/06; C; C04; C04B; C04B16/00; C04B16/04; C04B16/08; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249968; Y10T428/249971; Y10T428/249972; Y10T428/25; Y10T428/254; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
13 words
Pavement construction as claimed in claim 1 wherein said pavement layer is concrete.
Claim 2
Dependent Claim
15 words
Pavement construction as claimed in claim 1 wherein said pavement layer is bituminous pavement material.
Claim 3
Dependent Claim
19 words
Pavement construction as claimed in claim 1, said thermal insulation layer having a thickness of 10 to 30 cm.
Claim 4
Dependent Claim
19 words
Pavement construction as claimed in claim 1, said thermal insulation layer having a density of 300 to 700 kg/m3.
Claim 5
Dependent Claim
32 words
Pavement construction as claimed in claim 1, said thermal insulation layer containing 60 to 85 percent by volume of said beads of expanded polystyrene with reference to the concrete in said layer.
Claim 6
Dependent Claim
18 words
Pavement construction as claimed in claim 1, said beads having a mean diameter of 1.5 to 5 mm.
Claim 7
Dependent Claim
17 words
Pavement construction as claimed in claim 1, said beads having a density of 5 to 50 kg/m3.
Claim 8
Dependent Claim
27 words
Pavement construction as claimed in claim 1, said thermal insulation layer containing 1 to 20 percent by weight with reference to said beads of an adhesion promoter.
Claim 9
Dependent Claim
13 words
Pavement construction as claimed in claim 1, said hydraulic binder being hydraulic cement.
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |