US3603221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayered structure
Assignee: EIDP Inc
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Filing: 1968-10-30
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Granted: 1971-09-07
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Expires: 1988-10-30
Abstract
Abstract A multilayered structure comprising a base support, an unvulcanized elastomeric membrane at least 0.05 inch thick overcoated with an exposed cover layer. This structure is useful in roadway construction with particular application to bridge decks where vibration tends to accelerate crack formation allowing water to penetrate the roadbed where it freezes and thaws resulting in structural damage to conventional roadways. The membrane prevents water from penetrating the roadbed. As a bridge deck the base support is normally Portland cement concrete, the intermediate layer is the elastomeric membrane and the exposed cover layer is asphaltic concrete.
Inventors
- 👤 Robert Hall Barton
- 👤 Martin Luther Brown
- 👤 Andrew Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:14
CPC Classifications
E; E01; E01D; E01D19/00; E01D19/08; E01D19/083; C; C08; C08K; C08K3/00; C08K3/01; C08K3/013; C08K3/02; C08K3/04; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/04; C08K5/09; C08L; C08L23/00; C08L23/02; C08L23/16; C08L91/00; E01C; E01C7/00; E01C7/08; E01C7/32; E01C7/325; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
A multilayered structure according to claim 1 wherein the base layer is Portland cement concrete.
Claim 2
Dependent Claim
13 words
A multilayered structure according to claim 1 wherein the exposure layer is asphalt.
Claim 3
Dependent Claim
21 words
A multilayered structure according to claim 1 wherein a plastic film is interposed between the unvulcanized membrane and the exposure layer.
Claim 4
Dependent Claim
40 words
A multilayered structure according to claim 1 wherein the elastomeric membrane has at least 100 to 500 parts of filler per 100 parts of elastomer and at least 100 to 300 parts of plasticizing oil per 100 parts of elastomer.
Claim 5
Dependent Claim
31 words
A multilayered structure according to claim 1 wherein the elastomeric membrane is made from a copolymer of ethylene, propylene and at least one nonconjugated diene having only one polymerizable double bond.
Claim 6
Dependent Claim
12 words
A multilayered structure according to claim 1 wherein the copolymer is ethylene/propylene.
Claim 7
Dependent Claim
12 words
A multilayered structure according to claim 6 wherein the copolymer is ethylene/propylene/1,4-hexadiene.
Claim 8
Dependent Claim
62 words
A multilayered roadway comprising essentially a. a base layer of Portland cement concrete; b. an intermediate unvulcanized elastomeric membrane at least 0.05-inch thick, resistant to oxygen degradation and having a brittle point of less then 0* C. wherein the elastomeric membrane is 100 parts ethylene/propylene copolymer, 100-500 parts filler, and 100- 300 parts plasticizing oil; and e. an exposure layer of asphalt.
Claim 9
Dependent Claim
23 words
A multilayered roadway according to claim 9 wherein a plastic film is interposed between the unvulcanized membrane and the exposure layer of asphalt.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |