US3810707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joint structure and method
Assignee: 3M Co
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Filing: 1971-08-09
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Granted: 1974-05-14
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Expires: 1991-08-09
Abstract
Abstract A semi-rigid flat cover strip, having permanently bonded over one of its major surfaces a tacky, self-sealing, and shockresistant adhesive composition, is applied with its adhesive covered surface over the adjoined edges of adjacent structural members to provide a permanent joint structure which is useful, for example, as a highway construction joint.
Inventors
- 👤 B Tungseth
- 👤 J Lindlof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:40
CPC Classifications
E; E01; E01C; E01C11/00; E01C11/02; E01C11/04; E01C11/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
136 words
In a joint structure comprising adjacent structural members having coplanar surfaces and separated to define a narrow opening and a cover strip coextensive with the length of said opening and overlapping its edges, the improvement comprising a weakly cohesive self-sealing polymeric adhesive composItion covering said opening and adherently bonding together said strip and members, said adhesive composition having adhesion greater than cohesion and the following properties when tested as described in the specification: adhesion at least 10 gm./sq.cm. tensile at least 4 psi elongation at least 100% brittle point not above 20* F. slump not more than 1/8 inch whereby said structure is capable of precluding moisture from entering said narrow opening under damp conditions, permitting temporary failure caused by separation of said structural members, and thereafter resealing when said members return to sufficiently close proximity.
Claim 2
Dependent Claim
136 words
In a joint structure comprising adjacent structural members having coplanar surfaces and separated to define a narrow opening and a cover strip coextensive with the length of said opening and overlapping its edges, the improvement comprising a weakly cohesive self-sealing polymeric adhesive composItion covering said opening and adherently bonding together said strip and members, said adhesive composition having adhesion greater than cohesion and the following properties when tested as described in the specification: adhesion at least 10 gm./sq.cm. tensile at least 4 psi elongation at least 100% brittle point not above 20* F. slump not more than 1/8 inch whereby said structure is capable of precluding moisture from entering said narrow opening under damp conditions, permitting temporary failure caused by separation of said structural members, and thereafter resealing when said members return to sufficiently close proximity.
Claim 3
Dependent Claim
15 words
The structure of claim 1 wherein said cover strip is a strip of organic plastic.
Claim 4
Dependent Claim
23 words
The structure of claim 2 wherein said organic plastic cover strip has a plurality of longitudinally aligned pleats spaced interior from its edges.
Claim 5
Dependent Claim
23 words
The structure of claim 1 wherein said structural members are sections of a concrete highway and said structure forms a highway expansion joint.
Claim 6
Dependent Claim
23 words
The structure of claim 1 wherein said structural members are sections of a concrete highway and said structure forms a highway expansion joint.
Claim 7
Dependent Claim
50 words
The structure of claim 5 wherein said narrow opening is channeled to provide a shallow groove having dimensions substantially the same as those of said strip and being capable of receiving said adhesive coated strip to bring the outer surface of said strip into coplanar relationship with said highway strip.
Claim 8
Dependent Claim
14 words
The structure of claim 1 including an asphalt covering layer over said cover strip.
Claim 9
Dependent Claim
150 words
The structure of claim 1 wherein said adhesive composition is a self-healing tacky composition comprising: a major proportion of an aromatic hydrocarbon process oil having a viscosity of at least about 250 (SSU/210* F.), an initial boiling point of at least about 700* F., and an aromatic content (clay-gel method) of at least about 50%; and a minor proportion of a block copolymer having an average molecular weight of at least about 85,000 and having the type formula A-B-A wherein the A components acoount for about 10-40 percent of the total, each A represents a non-elastomeric vinyl arene polymer block having an average molecular weight of about 5,000 to about 125,000, and B represents an elastomeric conjugated diene polymer block having an average molecular weight of about 75,000 to about 250,000; the amount of said copolymer being between about 25 and about 50 parts per 100 parts of said oil.
Claim 10
Dependent Claim
25 words
The structure of claim 8 wherein said adhesive comprises between about 35 to about 45 parts of said copolymer per 100 parts of said oil.
Claim 11
Dependent Claim
27 words
The structure of claim 8 wherein said adhesive composition includes a polyolefin polymer in an amount up to about 30 parts per 100 parts of said copolymer.
Claim 12
Dependent Claim
13 words
The structure of claim 8 wherein said adhesive composition includes a tackifier resin.
Claim 13
Dependent Claim
14 words
The structure of claim 8 wherein said adhesive composition includes a paraffinic mineral oil.
Claim 14
Dependent Claim
130 words
In a method of sealing a concrete highway contraction joint comprising the steps of abrading a shallow channel in the surface of said highway along both sides of the joint area, placing adhesive in said channel and pressing a cover strip into said channel to bring the outer surface of said cover strip into coplanar relationship with said highway surface, the improvement comprising using as an adhesive a weakly cohesive self-sealing polymeric adhesive composition covering said opening and adherently bonding together said strip and members, said adhesive composition having adhesion greater than cohesion and the following properties when tested as described in the specification: adhesion at least 10 gm./sq.cm. tensile at least 4 psi elongAtion at least 100% brittle point not above 20* F. slump not more than 1/8 inch.
Claim 15
Dependent Claim
130 words
In a method of sealing a concrete highway contraction joint comprising the steps of abrading a shallow channel in the surface of said highway along both sides of the joint area, placing adhesive in said channel and pressing a cover strip into said channel to bring the outer surface of said cover strip into coplanar relationship with said highway surface, the improvement comprising using as an adhesive a weakly cohesive self-sealing polymeric adhesive composition covering said opening and adherently bonding together said strip and members, said adhesive composition having adhesion greater than cohesion and the following properties when tested as described in the specification: adhesion at least 10 gm./sq.cm. tensile at least 4 psi elongAtion at least 100% brittle point not above 20* F. slump not more than 1/8 inch.
Claim 16
Dependent Claim
33 words
The method of claim 13 including the additional step of covering said cover strip with a layer of asphalt in a thickness sufficient to obscure said strip and provide a smooth roadway surface.
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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) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |