US3201136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe joint of cast in place polyurethane
Assignee: 3M Co
•
Filing: 1965-03-17
•
Granted: 1965-08-17
•
Expires: 1985-03-17
Abstract
No abstract record available.
Inventors
- 👤 George C Harrison
- 👤 Lester G Axdahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:27
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/02; F16L21/05; Y; Y10; Y10S; Y10S277/00; Y10S277/924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A METHOD FOR CASTING IN PLACE ON THE END OF A PIPE SECTION A SOLID, DIMENSIONALLY STABLE, ALKALI AND ACID RESISTANT, BIOLOGICALLY INERT, NON-POROUS, UNPLASTICIZED, POLYURETHAN POLYMER RUBBER SEALING GASKET, WHICH SEALING GASKET IS ADAPTED TO INTERFIT WITH A COMPLEMENTARY GASKET IN AN ADJACENT PIPE SECTION TO SEAL THE JOINT BETWEEN SECTIONS, SAID METHOD COMPRISING (A) PROVIDING A MOLD FORM AROUND THE END OF THE PIPE SECTION ON WHICH THE GASKET IS TO BE CAST, (B) POURING INTO SAID FORM AN ELASTOMER FORMING LIQUID REACTION MIXTURE CONSISTING ESSENTIALLY OF AN AROMATIC DIISOCYANATE, A 1,2-POLYALKYLENE ETHER GLYCOL REPRESENTED BY THE FORMULA
Claim 2
Independent Claim
100 words
A METHOD FOR CASTING IN PLACE ON THE END OF A PIPE SECTION A SOLID, DIMENSIONALLY STABLE, ALKALI AND ACID RESISTANT, BIOLOGICALLY INERT, NON-POROUS, UNPLASTICIZED, POLYURETHAN POLYMER RUBBER SEALING GASKET, WHICH SEALING GASKET IS ADAPTED TO INTERFIT WITH A COMPLEMENTARY GASKET IN AN ADJACENT PIPE SECTION TO SEAL THE JOINT BETWEEN SECTIONS, SAID METHOD COMPRISING (A) PROVIDING A MOLD FORM AROUND THE END OF THE PIPE SECTION ON WHICH THE GASKET IS TO BE CAST, (B) POURING INTO SAID FORM AN ELASTOMER FORMING LIQUID REACTION MIXTURE CONSISTING ESSENTIALLY OF AN AROMATIC DIISOCYANATE, A 1,2-POLYALKYLENE ETHER GLYCOL REPRESENTED BY THE FORMULA
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
US3135519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |