Patent US5215824A successfully refreshed from Google Patents.
Patent US4552815A successfully refreshed from Google Patents.
US4552815A
Expired / Lapsed
US
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Prestressing elements coated with plastic material and process for making them
Assignee: BASF Corp
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Filing: 1983-09-22
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Granted: 1985-11-12
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Expires: 2003-09-22
Abstract
Abstract Prestressing elements having a two-layer plastics covering, the inner layer being moldable, storage-stable at room temperature and thermally curable, and the outer layer consisting of a radiation-cured plastics material, are excellently suitable for producing supporting structural elements, particularly concrete supporting structures and rock bracings.
Inventors
- 👤 Bernd Dreher
- 👤 Wolfgang Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:52
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/16; D07B1/162; C; C08; C08J; C08J3/00; C08J3/24; C08J3/243; E; E04; E04C; E04C5/00; E04C5/08; D07B2201/00; D07B2201/20; D07B2201/2083; D07B2201/2087; D07B2201/2088; D07B2501/00; D07B2501/20; D07B2501/2015; D07B2501/2023; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2922; Y10T428/2925; Y10T428/2927; Y10T428/2933; Y10T428/2938; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31518; Y10T428/31522; Y10T428/31551; Y10T428/31554; Y10T428/31573; Y10T428/31576; Y10T428/31605; Y10T428/31609; Y10T428/31616; Y10T428/31645; Y10T428/31649; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31699; Y10T428/31721
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
63 words
A prestressing element, which is metal, plastic, glass, carbon fibers or whiskers, onto which is applied an inner polymer-forming layer and an outer solid plastic layer, the said prestressing element being designed so that the inner layer consists of a moldable and thermally curable composition which is storage-stable at room temperature, and the outer layer consists of a plastic material cured by radiation.
Claim 2
Dependent Claim
63 words
A prestressing element, which is metal, plastic, glass, carbon fibers or whiskers, onto which is applied an inner polymer-forming layer and an outer solid plastic layer, the said prestressing element being designed so that the inner layer consists of a moldable and thermally curable composition which is storage-stable at room temperature, and the outer layer consists of a plastic material cured by radiation.
Claim 3
Dependent Claim
29 words
A prestressing element according to claim 1, wherein the composition of the inner layer contains starting materials curable into the form of duroplasts by means of polyaddition or polymerisation.
Claim 4
Dependent Claim
19 words
A prestressing element according to claim 2, wherein the starting materials are epoxy resins, masked polyurethanes or unsaturated polyesters.
Claim 5
Dependent Claim
17 words
A prestressing element according to claim 2, wherein the inner layer is a solid pre-reacted epoxy resin.
Claim 6
Dependent Claim
25 words
A prestressing element according to claim 1, wherein the curable composition of the inner layer contains a curing agent which can be activated by heat.
Claim 7
Dependent Claim
29 words
A prestressing element according to claim 5 wherein the curable composition of the inner layer contains a curing agent which can be activated by heat and a curing accelerator.
Claim 8
Dependent Claim
21 words
A prestressing element according to claim 1, wherein the curable composition contains an epoxy resin based on glycidyl ethers of polyphenols.
Claim 9
Dependent Claim
16 words
A prestressing element according to claim 1, wherein the outer layer is in addition thermally curable.
Claim 10
Dependent Claim
22 words
A prestressing element according to claim 8, wherein the outer layer is thermally curable by virtue of the presence of epoxy groups.
Claim 11
Dependent Claim
25 words
A prestressing element according to claim 1, wherein the outer layer contains functional groups which react concomitantly with the thermal curing of the inner layer.
Claim 12
Dependent Claim
37 words
A prestressing element according to claim 1, wherein the outer layer is a radiation-cured epoxyacrylate or epoxymethacrylate, epoxy resin, polyesteracrylate or -methacrylate based on bisphenol, an unsaturated polyurethane or polyester, or a polymer having maleimide side groups.
Claim 13
Dependent Claim
36 words
A prestressing element according to claim 11, wherein the outer layer is a radiation-cured epoxy-acrylate or epoxymethacrylate, each of which is additionally admixed with at least one acrylic ester or methacrylic ester of an aliphatic polyol.
Claim 14
Dependent Claim
25 words
A prestressing element according to claim 1 wherein the inner and outer layers are separated by an intermediate layer of glass fibers or metal filaments.
Claim 15
Dependent Claim
68 words
A process for producing a two-layer plastic coating for a prestressing element, which is metal, plastic, glass, carbon fibers or whiskers, which comprises (a) applying to the prestressing element an inner layer consisting of a moldable and thermally curable composition which is stable in storage at room temperature; (b) applying an outer layer of a composition curable by radiation; and (c) curing afterwards the outer layer by radiation.
Claim 16
Dependent Claim
68 words
A process for producing a two-layer plastic coating for a prestressing element, which is metal, plastic, glass, carbon fibers or whiskers, which comprises (a) applying to the prestressing element an inner layer consisting of a moldable and thermally curable composition which is stable in storage at room temperature; (b) applying an outer layer of a composition curable by radiation; and (c) curing afterwards the outer layer by radiation.
Claim 17
Dependent Claim
36 words
A process according to claim 14 wherein after step (a) the inner layer is coated first with a separating intermediate layer of glass fibers or metal filaments before the outer layer is applied in step (b).
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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) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |