US3772113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for sealing ruptures in pipes or vessels while in service with gaseous substances under pressure
Assignee: Dow Chemical Co
•
Filing: 1972-02-10
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Granted: 1973-11-13
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Expires: 1992-02-10
Abstract
Abstract Ruptures in pipes or vessels while in service with gaseous substances under pressure are repaired by casting a rapid-setting urethane composition about a cleaned area surrounding the rupture.
Inventors
- 👤 F Patrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:45
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/168; F16L55/175; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/12; C08L; C08L75/00; C08L75/04; C08L75/08; C09; C09K; C09K3/00; C09K3/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
30 words
The method of claim 1 wherein an adhesive layer is applied to the cleaned area surrounding the rupture in said pipe or vessel after cleaning said area surrounding said rupture.
Claim 2
Dependent Claim
19 words
sealing an enclosure having an opening therein for receiving a castable rapid-setting urethane composition about said pipe or vessel;
Claim 3
Dependent Claim
41 words
filling the cavity of the enclosure with a urethane composition which rapidly solidifies within about 5 minutes, after admixture of the components comprising said urethane composition; thereby sealing the rupture so as to prevent the escape of the gaseous substance therefrom.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein the pipe or vessel is under a pressure of less than about 125 psig.
Claim 5
Dependent Claim
22 words
The method of claim 3 wherein said rapid-setting urethane composition solidifies within 1 minute after the components comprising said composition are admixed.
Claim 6
Dependent Claim
18 words
The method of claim 4 wherein said pipe or vessel is constructed of a reinforced thermoset epoxy resin.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |