US3157478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fluid return line air eliminator
Assignee: Combustion Engineering Inc
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Filing: 1960-12-28
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Granted: 1964-11-17
•
Expires: 1980-12-28
Abstract
No abstract record available.
Inventors
- 👤 William M Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:19
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/04; F15B21/044; F22; F22D; F22D11/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
136 words
THE METHOD OF PREVENTING AIR PUMPING AND AIR ENTRAINMENT IN OIL IN A VENTED VERTICAL OIL GRAVITY RETURN PIPE RECEIVING OIL SLUGS COMPRISING FEEDING THE OIL IN SLUGS INTO SAID PIPE, INTERRUPTING THE FREE GRAVITY DROP OF ONE SIDE OF SAID SLUG AND CONVERTING THE FREE DROP ALONG AND AROUND THE INSIDE OF SAID PIPE TO A SPIRAL PATH, INTERRUPTING THE FREE DROP OF OTHER SIDE OF SAID SLUG AT THE NEXT SUCCEEDING TURN OF THE SPIRAL PATH, LIMITING THE THICKNESS OF THE OIL LAYER IN THE SPIRAL PATH BY SPILLING OIL OVER ONE EDGE OF SAID PATH TO THE NEXT SUCCEEDING TURN OF THE SPIRAL PATH UNTIL THE OIL LAYER GUIDED IN THE SPIRAL PATH AND CONFINED BY THE PIPE INNER SURFACE FLOWS IN A SMOOTH STREAM WITH A VENTED AIR LAYER ABOVE THE STREAM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |