US3801489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool for electrolytic drilling of holes
Assignee: UK Secretary of State for Defence
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Filing: 1971-07-07
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Granted: 1974-04-02
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Expires: 1991-07-07
Abstract
Abstract A TOOL FOR USE IN THE ELECTROLYTIC DRILLING OF HOLES, COMPRISING A SELF-SUPPORTING TUBE OF ELECTRICALLY INSULATING MATERIAL HAVING AN OPERATIVE FREE OPEN END, AN ELECTRICALLY CONDUCTING WIRE WHICH EXTENDS ALONG THE BORE OF THE TUBE, WITH CLEARANCE BETWEEN THE WIRE AND THE BORE, TO PERMIT FLOW OF ELECTROLYTE, AND A SUPPORT WHICH FIXES THE WIRE AXIALLY RELATIVELY TO THE TUBE SO THAT A FREE END OF THE WIRE IS WITHIN THE TUBE AND SPACED AXIALLY FROM THE FREE END OF THE TUBE, AND WHICH PROVIDES FOR ELECTRICAL CONNECTION TO THE WIRE, AND FOR SUPPLY OF ELECTROLYTE TO THE CLEARANCE.
Inventors
- 👤 D Samson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:24
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/26; B23H7/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |