Patent US2861938A successfully refreshed from Google Patents.
US2861938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic cells
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1955-04-01
•
Granted: 1958-11-25
•
Expires: 1975-04-01
Abstract
No abstract record available.
Inventors
- 👤 Glascodine Richard Dona Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:03
CPC Classifications
C; C25; C25C; C25C7/00; C25C7/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
AN IMPROVED SCRAPING DEVICE FOR REMOVING UNDESIRED METAL DEPOSITES FROM THE INNER WALL OF A VERTICAL RISER PIPE OR A SODIUM PRODUCING ELECTROLYTIC CELL COMPRISING, A SUBSTANTIALLY THE LENGTH OF THE RISER, A PLURALITY EXTENDING SUBSTANTIALLY THE LENGTH OF THE RISER, A PLURALITY OF VERTICALLY SPACED CUTTING HOOPS SECURED AT SUBSTANTIALLY EQUAL INTERVALS TO SAID SUPPORTING BAR, MEANS MOUNTING SAID BAR FOR REDCIPORCATING MOVEMENT WITHIN SAID RISER, UPPER AND LOWER STOP MEANS FOR LIMITING THE RECIPROCATING MOVEMENT OF SAID BAR TO BE PREDETERMINED AMIPLITUDE, SAID AMPLITUDE BEING AT LEAST EQUAL TO THE GREATEST DISTANCE BETWEEN CONSECTIVE HOOPS, AND DRIVING MEANS BEING OPERABLE TO IMPEL SAID BAR FORCEFULLY AGAINST SAID UPPER
Claim 2
Dependent Claim
110 words
AN IMPROVED SCRAPING DEVICE FOR REMOVING UNDESIRED METAL DEPOSITES FROM THE INNER WALL OF A VERTICAL RISER PIPE OR A SODIUM PRODUCING ELECTROLYTIC CELL COMPRISING, A SUBSTANTIALLY THE LENGTH OF THE RISER, A PLURALITY EXTENDING SUBSTANTIALLY THE LENGTH OF THE RISER, A PLURALITY OF VERTICALLY SPACED CUTTING HOOPS SECURED AT SUBSTANTIALLY EQUAL INTERVALS TO SAID SUPPORTING BAR, MEANS MOUNTING SAID BAR FOR REDCIPORCATING MOVEMENT WITHIN SAID RISER, UPPER AND LOWER STOP MEANS FOR LIMITING THE RECIPROCATING MOVEMENT OF SAID BAR TO BE PREDETERMINED AMIPLITUDE, SAID AMPLITUDE BEING AT LEAST EQUAL TO THE GREATEST DISTANCE BETWEEN CONSECTIVE HOOPS, AND DRIVING MEANS BEING OPERABLE TO IMPEL SAID BAR FORCEFULLY AGAINST SAID UPPER
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |