Patent US3836622A successfully refreshed from Google Patents.
US3836622A
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US
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Method of forming pipes
Assignee: Forsheda Ideutveckling AB
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Filing: 1972-06-30
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Granted: 1974-09-17
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Expires: 1992-06-30
Abstract
Abstract A method of forming pipes wherein the pipe wall may be constructed from fiber or threaded reinforced plastic and is formed on a mandrel and the pipe wall is provided with an inner annular wall for receiving elements in the form of a ring which is stretched onto the mandrel and the pipe wall is formed around the mandrel and the sealing ring.
Inventors
- 👤 S Sporre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:01
CPC Classifications
F; F16; F16L; F16L47/00; F16L47/06; F16L47/08; B; B29; B29C; B29C57/00; B29C57/02; B29C57/025; Y; Y10; Y10S; Y10S425/00; Y10S425/218; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |