US3753879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for producing holes
Assignee: Associated Engineering Ltd
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Filing: 1971-02-03
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Granted: 1973-08-21
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Expires: 1991-02-03
Abstract
Abstract THIS INVENTION RELATES TO THE PRODUCTION, BY ELECTROCHEMICAL MACHINING, OF HOLES OF THE REQUIRED FLOW CHARACTERISSTICS, IN WORKPIECES SUCH AS INJECTORR NOZZLES OF FUEL INJECTION EQUIPMENT. ACCORDING TO THIS INVENTION, AFTER A HOLE HAS BEEN INITIALLY FORMED UNDERSIZE, IT IS ENLARGED BY PASSING THERETHROUGH A LIQUID ELECCTROLYTE WHILST A CURRENT FLOWS BETWEEN THE WORKPIECE AND A TOOL ASSOCIATED THEREWITH. THE CHANGE IN FLOW RATE OF ELECTROLYTE, OR THE CHANGE IN PRESSURE DROP ACROSS THE HOLE, IS SENSED AS THE HOLLE IS ENLARGED, AND THE ELECTROCHEMICAL MACHINING IS STOPPED WHEN THE FLOW RATE, OR PRESSURE DROP, REACHES A PREDETERMINED VALUE.
Inventors
- 👤 T Blee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:22
CPC Classifications
F; F02; F02M; F02M61/00; F02M61/16; F02M61/18; F02M61/1806; B; B23; B23H; B23H9/00; B23H9/02; B23H9/14; F02M61/168
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |