US2821205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for lubricating pipe lines
Assignee: Shell Development Co
•
Filing: 1952-10-31
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Granted: 1958-01-28
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Expires: 1972-10-31
Abstract
No abstract record available.
Inventors
- 👤 Ernest G Chilton
- 👤 Lauren R Handley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:07
CPC Classifications
F; F17; F17D; F17D1/00; F17D1/08; F17D1/16; F15; F15D; F15D1/00; F15D1/02; F15D1/06; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T137/2931; Y10T137/3003; Y10T137/3006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
THE METHOD OF TRANSPORTING A VISOUS LIQUID THROUGH A PIPE LINE, COMPRISING THE STEP OF CONTINUOUSLY PUMPING CATING FILM OF A LOW VISCOSITY LIQUID INTO THE PIPE LINE ON THE INNER WALL THEREOF, AND EXTRACTING SAID LOW VISCOSITY
Claim 2
Independent Claim
38 words
THE METHOD OF TRANSPORTING A VISOUS LIQUID THROUGH A PIPE LINE, COMPRISING THE STEP OF CONTINUOUSLY PUMPING CATING FILM OF A LOW VISCOSITY LIQUID INTO THE PIPE LINE ON THE INNER WALL THEREOF, AND EXTRACTING SAID LOW VISCOSITY
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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) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |