US3578733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making jointed concrete structures
Assignee: WR Grace and Co
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Filing: 1968-05-23
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Granted: 1971-05-11
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Expires: 1988-05-23
Abstract
Abstract CONCRETE IS CAST WITH A DUMMY JOINT SEALED BY A FLEXIBLE WATER STOP EMBEDDED BY KEYING FORMATIONS INTO THE CONCRETE, BY A METHOD IN WHICH A CRACK IS FORMED AS THE DUMMY JOINT, A CRACK-INDUCING BODY, EG., A PIECE OF WOOD BEING FIXED IN POSITION, E.G., BY SPRING CLIPS, OPPOSITE THE CENTRE LINE OF EACH WATER STOP. THE INVENTION ALSO INCLUDES A NOVEL ASSEMBLY OF A WATER STOP AND A SPRING CLIP FOR HOLDING THE CRACK-INDUCING BODY.
Inventors
- 👤 John Hurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:20
CPC Classifications
E; E02; E02B; E02B3/00; E02B3/16; E04; E04F; E04F15/00; E04F15/12; E04F15/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |