US3553415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge machining employing gas dispersed in a liquid dielectric
Assignee: DEAN C GIRARD
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Filing: 1968-10-23
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Granted: 1971-01-05
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Expires: 1988-10-23
Abstract
Abstract A spark erosion machining apparatus having a dielectric coolant feed system is described which incorporates into the liquid dielectric, prior to injection thereof into the spark gap between the electrode and the workpiece, a material component productive of a dispersed gas phase for accelerating swarf removal and machining rates.
Inventors
- 👤 Dean C Girard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:45
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
The method of claim 1 further defined in that said inert component is selected from the group of gases consisting of helium, neon, argon, krypton, xenon, nitrogen, and carbon dioxide.
Claim 2
Dependent Claim
19 words
The method of claim 2 further defined in that said inert component phase comprises 40 per cent by volume.
Claim 3
Dependent Claim
30 words
The method of claim 3 further defined in that said inert component phase comprises 75 per cent by volume of argon and 25 per cent by volume of carbon dioxide.
Claim 4
Dependent Claim
27 words
The method of claim 1 further defined in that said inert component phase is selected from the group consisting of trichlorofluoromethane, dichlorodifluoromethane, carbon tetrafluoride, cryofluorane, and octafluorocyclobutane.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |