Patent US3565689A successfully refreshed from Google Patents.
US3565689A
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US
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Method and apparatus for purging liquid and liquid vapor from the inside of an elongated tube
Assignee: Nortel Networks Ltd
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Filing: 1968-12-31
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Granted: 1971-02-23
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Expires: 1988-12-31
Abstract
Abstract A SOURCE OF DRY PRESSURIZED GAS IS APPLIED ABOUT A REAR END SURFACE OF AN ELONGATED PROJECTILE IN A CONFINED SPACE TO PROPEL THE PROJECTILE INTO THE INTERIOR OF A TUBE TO BE PURGED OF LIQUID AND LIQUID VAPOR, AND THE SUPPLY OF GAS IS MAINTAINED UNDER PRESSURE ABOUT THE REAR END SURFACE OF THE PROJECTILE TO DRIVE IT TOWARD A REMOTE OPEN END OF THE TUBE.
Inventors
- 👤 James H Lowe
- 👤 Christopher E Wainwright
- 👤 William E J Moss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:32
CPC Classifications
H; H02; H02G; H02G9/00; F; F17; F17D; F17D3/00; F17D3/03; H02G15/00; H02G15/20; H02G15/26
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |