Patent US4821881A successfully refreshed from Google Patents.
Patent US3570065A successfully refreshed from Google Patents.
US3570065A
Expired / Lapsed
US
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Pipe belling
Assignee: ConocoPhillips Co
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Filing: 1968-03-21
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Granted: 1971-03-16
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Expires: 1988-03-21
Abstract
Abstract A RAM ASSEMBLY FOR FORMING A SQUARE SHOULDERED BELL ON A PLASTIC PIPE END, COMPRISING A SEGMENTED RAM CONTAINING A DEFORMABLE ANNULAR RING.
Inventors
- 👤 Fernando V Guerrero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:06
CPC Classifications
B; B29; B29C; B29C57/00; B29C57/02; B29C57/04; B29C57/06; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4439; G02B6/4459; Y; Y10; Y10S; Y10S425/00; Y10S425/218
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |