US2764540A
Expired / Lapsed
US
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Method and means for electropolishing inner surfaces
Assignee: Individual
•
Filing: 1952-09-10
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Granted: 1956-09-25
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Expires: 1972-09-10
Abstract
No abstract record available.
Inventors
- 👤 William G Farin
- 👤 Paul F Duddy
- 👤 Glen A Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:45
CPC Classifications
C; C25; C25F; C25F7/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
143 words
THE METHOD OF ELECTROPOLISHING THE INSIDE OF AN ELONGATED SUBSTANTIALLY TUBULAR BODY THE ENDS OF WHICH OCCUPY DIFFERENT HEIGHTS WHICH CONSISTS IN CIRCULATING AN ELECTROLYTIC LIQUID UNDER PRESSURE THROUGH THE SUBSTANTIALLY TUBULAR BODY TO BE ELECTROPOLISHED AND THROUGH FLUID STORAGE SPACES IN COMMUNICATION WITH THE ENDS OF THE TUBULAR BODY AND THROUGH A PIPE SYSTEM JOINING SAID FLUID STORAGE SPACES, IN PUMPING THE ELECTROLYTE UNDER PRESSURE INTO THE SAID TUBULAR BODY AT THE LOWER END OF THE SAME AND IN DRIVING IT THROUGH THE SAID TUBULAR BODY TO THE UPPER END, IN DIVIDING SAID ELECTROLYTE FILLED SUBSTANTIALLY TUBULAR BODY INTO SECTIONS IN SUBSTANTIALLY INSULATING ONE ELONGATED TUBULAR SECTION WITH RESPECT TO ELECTROLYTIC ACTION, FORMING A CHAMBER SUBSTANTIALLY CLOSED AT ITS ENDS THROUGH WHICH THE ELECTROLYTE MAY HOWEVER CIRCULATE, IN APPLYING TO THE SUBSTANTIALLY TUBULAR BODY A VOLTAGE ADAPTED TO PRODUCE OPERATION THEREOF AS
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) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |