US3219568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic hole forming apparatus
Assignee: Rolls Royce PLC
•
Filing: 1961-06-02
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Granted: 1965-11-23
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Expires: 1981-06-02
Abstract
No abstract record available.
Inventors
- 👤 Wilkinson Bernard Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:28
CPC Classifications
B; B23; B23H; B23H3/00; B23H3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A CATHODE ELECTRODE FOR FORMING A HOLE ELECTROLYTICALLY IN A METALLIC ACODE WORKPIECE, COMPRISING A METAL TUBE HAVING AN OPEN FORWARD ANNULAR WORKING RIM, AND AN INSULATING PLUG WHICH IS AXIALLY SLIDABLY MOUNTED CONCENTRICALLY IN THE TUBE, SAID PLUG HAVING A FORWARD PORTION OF SMALLER EXTERNAL CROSS SECTION THAN THE INTERNAL CROSS SECTION OF THE TUBE SO THAT SAID PORTION DEFINES WITH THE TUBE AN ANNULAR PASSAGE WHOSE FORWARD END IS OPEN, SAID PORTION HAVING A PLANE FORWARD END FACE WHICH IS MOVABLE REARWARDLY OF SAID RIM WITHIN THE TUBE AND SAID PASSAGE COMMUNICATING WITH ELECTROLYTE CONDUIT MEANS SO THAT A FLOW OF ELECTROLYTE CAN PASS THROUGH THE ELECTRODE VIA SAID CONDUIT MEANS AND SAID PASSAGE
Claim 2
Dependent Claim
116 words
A CATHODE ELECTRODE FOR FORMING A HOLE ELECTROLYTICALLY IN A METALLIC ACODE WORKPIECE, COMPRISING A METAL TUBE HAVING AN OPEN FORWARD ANNULAR WORKING RIM, AND AN INSULATING PLUG WHICH IS AXIALLY SLIDABLY MOUNTED CONCENTRICALLY IN THE TUBE, SAID PLUG HAVING A FORWARD PORTION OF SMALLER EXTERNAL CROSS SECTION THAN THE INTERNAL CROSS SECTION OF THE TUBE SO THAT SAID PORTION DEFINES WITH THE TUBE AN ANNULAR PASSAGE WHOSE FORWARD END IS OPEN, SAID PORTION HAVING A PLANE FORWARD END FACE WHICH IS MOVABLE REARWARDLY OF SAID RIM WITHIN THE TUBE AND SAID PASSAGE COMMUNICATING WITH ELECTROLYTE CONDUIT MEANS SO THAT A FLOW OF ELECTROLYTE CAN PASS THROUGH THE ELECTRODE VIA SAID CONDUIT MEANS AND SAID PASSAGE
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |