US3632732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming sockets
Assignee: Dynamit Nobel AG
•
Filing: 1969-10-21
•
Granted: 1972-01-04
•
Expires: 1989-10-21
Abstract
Abstract A process for forming, at the end of a pipe fabricated from a synthetic resin material, a socket having external ribs, beads, or the like, extending in cross-sectional planes or helically, which comprises the insertion of a temperature-controlled mandrel in the end of an initially-heated pipe, simultaneously imparting a rotary motion to the mandrel as it is axially advanced and, upon cooling of the pipe end, withdrawal of the mandrel with further rotary motion thereof.
Inventors
- 👤 Gerhard Osterhagen
- 👤 Friedhelm Krebsbach
- 👤 Waldemar Wissinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:55
CPC Classifications
B; B29; B29C; B29C57/00; B29C57/02; B29D; B29D1/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |