Patent US3954274A successfully refreshed from Google Patents.
US3954274A
Expired / Lapsed
US
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Clay tile pipe joint seal containing foamed unsaturated polyester resin
Assignee: Cook Composites and Polymers Co
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Filing: 1974-10-21
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Granted: 1976-05-04
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Expires: 1994-10-21
Abstract
Abstract An improved joint seal for a clay tile pipe having bell and spigot configurations is provided with unsaturated polyester resin in a foamed, low density state, preferably below about 50 pounds per cubic foot.
Inventors
- 👤 Eugene J. Grandlic
- 👤 Stanley N. Korb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:22
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/10; C; C08; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/23; C09; C09J; C09J167/00; C09J167/06; C08L; C08L2666/00; C08L2666/28; C08L2666/36; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S277/00; Y10S277/935; Y10S277/944
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
The method of making a joint sealing gasket for the bell end of a clay tile pipe which comprises: applying to the inner surface of the said bell end a composition comprising: unsaturated polyester resin syrup, a metal salt activator and a peroxy initiator for the syrup, and inert fillers, and an alphahydroxy azo blowing agent, retaining the said composition in engagement with the said inner surface until it cures to a sleeve-like gasket having a density in the range of 25 to 65 pounds per cubic foot.
Claim 2
Independent Claim
88 words
The method of making a joint sealing gasket for the bell end of a clay tile pipe which comprises: applying to the inner surface of the said bell end a composition comprising: unsaturated polyester resin syrup, a metal salt activator and a peroxy initiator for the syrup, and inert fillers, and an alphahydroxy azo blowing agent, retaining the said composition in engagement with the said inner surface until it cures to a sleeve-like gasket having a density in the range of 25 to 65 pounds per cubic foot.
Claim 3
Dependent Claim
60 words
The method of claim 1 employing as a blowing agent an alpha-hydroxy azo compound having a formula ##EQU5## wherein R 1 and R 2 are lower alkyl groups having one to four carbon atoms and R 3 is a tertiary alkyl group having four to eight carbon atoms or an aromatic-substituted tertiary alkyl group having nine to twelve carbon atoms.
Claim 4
Dependent Claim
11 words
The method of claim 2 employing as the blowing agent ##EQU6##
Claim 5
Dependent Claim
37 words
The method of claim 1 wherein the said inner surface of the bell end of the clay tile pipe is primed with a primer which is co-reactive with the clay tile surface and with the said composition.
Claim 6
Dependent Claim
18 words
The method of claim 4 wherein the said primer includes as its co-reactive ingredient acryloxy propyl methoxy silane.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the said metal salt activator is a copper salt.
Claim 8
Dependent Claim
19 words
A clay tile pipe having a sealing gasket in its bell end produced by the method of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |