Method of forming a lap joint between tubular articles of thermoplastic material
Abstract
Abstract A method of forming a lap joint between tubular articles of thermoplastic material, wherein a reinforcing sleeve is positioned within the end portion of one of the articles that is to be disposed within a complementary end portion of the other of the articles, the reinforcing sleeve being formed of a material that has a melting point that is higher than that of the thermoplastic material of each of the articles. Thereafter, the end portions of the articles are heated, either before or after they are overlapped to form the lap joint, to melt the outer surface of the end portion of the one article and the inner surface of the end portion of the other article, thereby effecting the fusion welding of the end portions of the articles. The reinforcing sleeve serves to prevent the end portion of the one article from deforming when it is heated and inserted into the other article or when it is heated while disposed within the end portion of the other article.
Inventors
- 👤 E Wise
Bibliographic Details
Claims Analysis
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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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |