US3808762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waterstops
Assignee: WR Grace and Co Conn
•
Filing: 1973-02-01
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Granted: 1974-05-07
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Expires: 1993-02-01
Abstract
Abstract Novel external waterstops for use in sealing concrete joints which comprise a deformable section which forms a grout-tight seal with stop-end shuttering is positioned against the waterstop.
Inventors
- 👤 J Hurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:02
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/66; E04B1/68; E04B1/6806; E21; E21B; E21B43/00; E21B43/16; E21B43/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
A waterstop of the type used to provide a water seal at a face of a concrete joint formed by two adjacent and separately poured masses of concrete, said waterstop comprising a strip of moisture or water-resistant flexible material not sufficiently deformable by shuttering placed thereon to effect a grout-tight seal therewith, said strip having a longitudinally extending center line and at least one keying formation projecting laterally from said strip on each side of the center line thereof, said keying formations all projecting from the same face of said strip and running longitudinally along the length thereof, said keying formations being structured such that the formations broaden out from the point at which they project from said strip, said strip further having substantially at said center line a raised, closed cell foam portion more easily deformable than said strip and running longitudinally along the length of said strip and projecting laterally from the same surface as said keying formations, said foam portion being sufficiently deformable by shuttering placed thereon to effect a grout-tight seal therewith.
Claim 2
Dependent Claim
176 words
A waterstop of the type used to provide a water seal at a face of a concrete joint formed by two adjacent and separately poured masses of concrete, said waterstop comprising a strip of moisture or water-resistant flexible material not sufficiently deformable by shuttering placed thereon to effect a grout-tight seal therewith, said strip having a longitudinally extending center line and at least one keying formation projecting laterally from said strip on each side of the center line thereof, said keying formations all projecting from the same face of said strip and running longitudinally along the length thereof, said keying formations being structured such that the formations broaden out from the point at which they project from said strip, said strip further having substantially at said center line a raised, closed cell foam portion more easily deformable than said strip and running longitudinally along the length of said strip and projecting laterally from the same surface as said keying formations, said foam portion being sufficiently deformable by shuttering placed thereon to effect a grout-tight seal therewith.
Claim 3
Dependent Claim
15 words
The waterstop of claim 1 wherein the width of the deformable section is 1-2 inches.
Claim 4
Dependent Claim
55 words
The waterstop of claim 1 wherein there is employed at least two pairs of said keying formations, one pair being positioned on one side of said center line the remaining pair being positioned on the other side of said center line, the two outermost keying formations being spaced inwardly from the edges of said strip.
References Cited (Backward Citations)
US2139851A
Cited
US3583120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |