US3664783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the production of tubing
Assignee: Individual
•
Filing: 1969-08-28
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Granted: 1972-05-23
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Expires: 1989-08-28
Abstract
Abstract APPARATUS FOR MAINTAINING A DIFFERENCE IN INTERNAL PRESSURE LEVELS BETWEEN ADJACENT PORTIONS OF THE PATH OF AN ADVANCING FLEXIBLE TUBE. THE APPARATUS INCLUDES A PLURALITY OF CLAMPING MEANS WHICH SUCCESSIVELY ENGAGE WITH THE TUBE AND MOVE WITH IT AS IT PASSES FROM ONE PORTION OF IT PATHS TO THE NEXT. AT LEAST ONE OF THE CLAMPING MEANS IS IN ENGAGEMENT WITH THE TUBE AT ANY INSTANT. THE CLAMPING MEANS MAY COMPRISE OPPOSED PRESSURE PADS ON ENDLESS CONVEYORS MOVING ALONGSIDE THE TUBE.
Inventors
- 👤 Dudley Stuart Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:13
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/06; B29C61/08; B29C43/00; B29C43/22; B29C48/00; B29C48/25; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92514; B29C2948/92523; B29C2948/92609; B29C2948/92704; B29C2948/92819; B29C2948/92923; B29C48/001; B29C48/0018; B29C48/0022; B29C48/03; B29C48/09; B29C48/10
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |