US4091124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing an improved concrete electrical insulator
Assignee: ABB Inc USA
•
Filing: 1976-04-21
•
Granted: 1978-05-23
•
Expires: 1996-04-21
Abstract
Abstract An improved electrical grade concrete insulator is prepared by immersing a self-supporting concrete body impregnated with an uncured polymer in a liquid curable resin bath, curing said polymer, separating said body from said resin bath whereby said body has a secondary impregnation filling the voids produced when the primary impregnation shrinks on curing. The residual resin on the outside also forms a thin sealant coating on the surface of said body.
Inventors
- 👤 David H. Reighter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:45
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/46; C04B41/48; C04B41/60; C04B41/61; C04B41/62; C04B41/63; H; H01; H01B; H01B19/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
A method of producing an improved polymer containing concrete electrical insulator which comprises (a) immersing a self-supporting concrete body comprising a mixture of cement and aggregate, which has curable resin bath, (b) curing said polymer while immersed in said bath under conditions such that the entire resin bath does not also cure, (c) separating said body from said resin bath, and then (d) curing said resin so as to form a secondary sealant of the porosity of said body caused by the shrinkage of said uncured polymer as it cures.
Claim 2
Independent Claim
90 words
A method of producing an improved polymer containing concrete electrical insulator which comprises (a) immersing a self-supporting concrete body comprising a mixture of cement and aggregate, which has curable resin bath, (b) curing said polymer while immersed in said bath under conditions such that the entire resin bath does not also cure, (c) separating said body from said resin bath, and then (d) curing said resin so as to form a secondary sealant of the porosity of said body caused by the shrinkage of said uncured polymer as it cures.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said polymer is an electrical insulation grade epoxy resin.
Claim 4
Dependent Claim
37 words
The method of claim 2 wherein said polymer is an uncured epoxy resin which additionally contains hardener and catalyst therefor, the combination of epoxy resin, hardener and catalyst being adapted to cure at other than ambient conditions.
Claim 5
Dependent Claim
21 words
The method of claim 3 wherein said epoxy resin, hardener and catalyst are adapted to cure at 200° to 400° F.
Claim 6
Dependent Claim
21 words
The method of claim 4 wherein said epoxy resin is a hydantoin epoxy resin and said hardener is an anhydride hardener.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein said self-supporting concrete body comprises a mixture of substantially uncured polymer, Portland cement and aggregate.
Claim 8
Dependent Claim
15 words
The method of claim 6 wherein said polymer is an electrical insulation grade epoxy resin.
Claim 9
Dependent Claim
37 words
The method of claim 7 wherein said polymer is an uncured epoxy resin which additionally contains hardener and catalyst therefor, the combination of epoxy resin, hardener and catalyst being adapted to cure at other than ambient conditions.
Claim 10
Dependent Claim
21 words
The method of claim 8 wherein said epoxy resin, hardener and catalyst are adapted to cure at 200 to 400° F.
Claim 11
Dependent Claim
21 words
The method of claim 9 wherein said epoxy resin is a hydantoin epoxy resin and said hardener is an anhydride hardener.
References Cited (Backward Citations)
US2307629A
Cited
US2657153A
Cited
US2861011A
Cited
US3004862A
Cited
US3372052A
Cited
US3447955A
Cited
US3650804A
Cited
US3900622A
Cited
US3691512A
Cited
US3922413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |