Patent US2790428A successfully refreshed from Google Patents.
Patent US3285844A successfully refreshed from Google Patents.
US3285844A
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Electrolytic hole forming cathode electrode
Assignee: Rolls Royce PLC
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Filing: 1962-11-19
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Granted: 1966-11-15
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Expires: 1982-11-19
Abstract
No abstract record available.
Inventors
- 👤 Hallsworth Raymond Thomas
- 👤 Holroyd Irvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:20
CPC Classifications
B; B23; B23H; B23H3/00; B23H3/04; B23H9/00; B23H9/14; B23H9/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
AN ELECTRODE FOR USE AS A CATHODE ELECTRODE IN APPARATUS FOR FORMING HOLES ELECTROLYTICALLY IN A METALLIC ANODE WORKPIECE, COMPRISING A HOLLOW ELONGATE METALLIC MEMBER HAVING AN UNINSULATED FORWARD WORKING TIP, AN INTERMEDIATE PORTION ADJACENT SAID WORKING TIP, AND A REAR PORTION, THE INTERMEDIATE PORTION HAVING A FIRST EXTERNAL INSULATING COATING EXTENDING REARWARDLY FROM SAID WORKING TIP, AND SAID REAR PORTION HAVING A SECOND EXTERNAL INSULATING COATING FORMING A CONTINUATION OF SAID FIRST COATING, SAID SECOND COATING COMPRISING A NON-POROUS COMPOSITE COATING OF POLYVINYLCHLORIDE BONDED TO THE EXTERNAL SURFACE OF SAID REAR PORTION, AND SAID FIRST COATING BEING MADE OF STRONG, DURABLE EPOXY RESIN MATERIAL.
Claim 2
Dependent Claim
105 words
AN ELECTRODE FOR USE AS A CATHODE ELECTRODE IN APPARATUS FOR FORMING HOLES ELECTROLYTICALLY IN A METALLIC ANODE WORKPIECE, COMPRISING A HOLLOW ELONGATE METALLIC MEMBER HAVING AN UNINSULATED FORWARD WORKING TIP, AN INTERMEDIATE PORTION ADJACENT SAID WORKING TIP, AND A REAR PORTION, THE INTERMEDIATE PORTION HAVING A FIRST EXTERNAL INSULATING COATING EXTENDING REARWARDLY FROM SAID WORKING TIP, AND SAID REAR PORTION HAVING A SECOND EXTERNAL INSULATING COATING FORMING A CONTINUATION OF SAID FIRST COATING, SAID SECOND COATING COMPRISING A NON-POROUS COMPOSITE COATING OF POLYVINYLCHLORIDE BONDED TO THE EXTERNAL SURFACE OF SAID REAR PORTION, AND SAID FIRST COATING BEING MADE OF STRONG, DURABLE EPOXY RESIN MATERIAL.
References Cited (Backward Citations)
US3120482A
Cited
US3196093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |