Patent US2821205A successfully refreshed from Google Patents.
US2821205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for lubricating pipe lines
Assignee: Shell Development Co
•
Filing: 1952-10-31
•
Granted: 1958-01-28
•
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
References Cited (Backward Citations)
US2170247A
Cited
US759374A
Cited
US808782A
Cited
US1192438A
Cited
US1767958A
Cited
US2104519A
Cited
US2315044A
Cited
US2533878A
Cited
US2673648A
Cited
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 |