Patent US3900677A successfully refreshed from Google Patents.
US3900677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion joint seal
Assignee: Fox Industries Inc
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Filing: 1972-11-24
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Granted: 1975-08-19
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Expires: 1992-11-24
Abstract
Abstract An expansion joint seal is formed of two plastic, resilient materials and is used in joints between sections of formed concrete or structural metal wherever normal contraction and expansion of the sections occur adjacent to the joints. A core of the seal is formed from one plastic material, such as polybutadiene, which has a consistent resiliency over an extremely wide range of temperatures normally encountered in the outside environment. The second material is usually neoprene and forms spaced inner and outer shells and linking supporting ribs. The inner shell is formed about the core. The linking supporting ribs provide for a collapsing and expansion effect when the adjacent concrete or metal sections are expanding or contracting while the highly resilient core provides a superior resiliency for the seal.
Inventors
- 👤 Dennis G Barber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:48
CPC Classifications
E; E01; E01C; E01C11/00; E01C11/02; E01C11/04; E01C11/10; E01C11/106; E04; E04B; E04B1/00; E04B1/62; E04B1/66; E04B1/68; E04B1/6803; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2935
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
AN EXPANSION JOINT SEAL FOR SEALING A JOINT BETWEEN SPACED SECTIONS, COMPRISING: A RESILIENT OUTER SHELL FOR ENGAGING ADJACENT SURFACES OF THE SPACED SECTIONS, A RESILIENT INNER SHELL, A SPONGE-LIKE CORE HELD WITHIN THE INNER SHELL AND BEING CONTIGUOUSLY SURROUNDED THEREBY FOR PROVIDING OUTWARDLY DIRECTED FORCES, THE SPONGE-LIKE CORE BEING COMPOSED OF A MATERIAL WHICH IS SUBSTANTIALLY CRYSTALLIZATION FREE AN CAPABLE OF MINTAINING RESILIENCY OVER A WIDE ENVIRONMENTAL TEMPERATURE RANGE, AND, A PLURALITY OF WEB-LIKE RIBS DISPOSED BETWEEN THE INNER AND OUTER SHELLS, THE RIBS EXTENDING SUBSTANTIALLY RADIALLY FROM THE INNER SHELL TOWARD THE OUTER SHELL AND BEING AFFIXED TO THE INTERIOR SURFACES OF THE OUTER SHELL AND TO THE EXTERIOR SURFACES OF THE INNER SHELL, THE RIBS TRANSMITTING THE OUTWARDLY DIRECTED FORCES OF SAID CORE TO THE OUTER SHELL TO URGE SAID OUTER SHELL INTO SEALING ENGAGEMENT WITH THE SPACED SECTIONS.
Claim 2
Dependent Claim
142 words
AN EXPANSION JOINT SEAL FOR SEALING A JOINT BETWEEN SPACED SECTIONS, COMPRISING: A RESILIENT OUTER SHELL FOR ENGAGING ADJACENT SURFACES OF THE SPACED SECTIONS, A RESILIENT INNER SHELL, A SPONGE-LIKE CORE HELD WITHIN THE INNER SHELL AND BEING CONTIGUOUSLY SURROUNDED THEREBY FOR PROVIDING OUTWARDLY DIRECTED FORCES, THE SPONGE-LIKE CORE BEING COMPOSED OF A MATERIAL WHICH IS SUBSTANTIALLY CRYSTALLIZATION FREE AN CAPABLE OF MINTAINING RESILIENCY OVER A WIDE ENVIRONMENTAL TEMPERATURE RANGE, AND, A PLURALITY OF WEB-LIKE RIBS DISPOSED BETWEEN THE INNER AND OUTER SHELLS, THE RIBS EXTENDING SUBSTANTIALLY RADIALLY FROM THE INNER SHELL TOWARD THE OUTER SHELL AND BEING AFFIXED TO THE INTERIOR SURFACES OF THE OUTER SHELL AND TO THE EXTERIOR SURFACES OF THE INNER SHELL, THE RIBS TRANSMITTING THE OUTWARDLY DIRECTED FORCES OF SAID CORE TO THE OUTER SHELL TO URGE SAID OUTER SHELL INTO SEALING ENGAGEMENT WITH THE SPACED SECTIONS.
Claim 3
Dependent Claim
19 words
The expansion joint seal of claim 1 wherein the outer shell, inner shell, and ribs are formed of neoprene.
Claim 4
Dependent Claim
14 words
The expansion joint seal of claim 1 wherein the core is formed of polybutadiene.
Claim 5
Dependent Claim
18 words
The expansion joint seal of claim 1 wherein the outer shell, inner shell, and ribs are formed integrally.
Claim 6
Dependent Claim
81 words
The expansion joint seal of claim 1 wherein the inner shell is circular in cross-section, the core completely filling the cylindrical chamber formed by said inner shell, compression of the joint seal causing the core to produce radially directed restoring forces which are transmitted evenly to the inner shell, the inner shell transmitting said forces to the outeR shell through the ribs, the ribs extending from the inner shell toward the walls of the outer shell which engage the spaced sections.
Claim 7
Dependent Claim
52 words
The expansion joint of claim 5 wherein the outer shell comprises oppositely spaced side walls which are straight-sided and flushly engage the walls of the spaced sections, the forces transmitted from the core to the outer shell being evenly directed against the spaced sections by the side walls of the outer shell.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |