US4623773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrospark machining solution
Assignee: Mitsubishi Electric Corp
•
Filing: 1984-03-19
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Granted: 1986-11-18
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Expires: 2004-03-19
Abstract
Abstract A nonflammable electrospark machining solution which provides a high machining rate composed primarily of a saccharide such as cane sugar, fruit sugar or malt sugar with the density of saccharide being 5 to 55% by weight. A preservative may be added such as benzoic acid, salicylic acid, dehydroacetic acid or ethyl para-hydroxybenzoate with the latter being preferred in an amount of 0.01 to 0.1% by weight of the machining solution. Also, an anticorrosive such as sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine is preferably added in an amount of 0.05 to 0.1% by weight of the machining solution.
Inventors
- 👤 Masahiro Onizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:36
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/08
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
93 words
An electrospark machining device comprising an electrospark machining electrode positioned in a non-flammable electrospark machining solution consisting essentially of an aqueous solution of saccharide, said machining solution having an electrical insulating characteristic high enough to cause spark discharge, and power means to produce a spark discharge (high power density arcs) in a gap between said electrode and an electrically conductive work piece, whereby spark discharges from said electrode are produced in a gap between said electrode and said work piece to machine said work piece when said device is used for electrospark machining.
Claim 2
Dependent Claim
93 words
An electrospark machining device comprising an electrospark machining electrode positioned in a non-flammable electrospark machining solution consisting essentially of an aqueous solution of saccharide, said machining solution having an electrical insulating characteristic high enough to cause spark discharge, and power means to produce a spark discharge (high power density arcs) in a gap between said electrode and an electrically conductive work piece, whereby spark discharges from said electrode are produced in a gap between said electrode and said work piece to machine said work piece when said device is used for electrospark machining.
Claim 3
Dependent Claim
91 words
An electrospark machining device comprising an electrospark machining electrode positioned in a non-flammable electrospark mmachining solution having an insulation resistance of at least 1×10 4 Ωcm, said solution consisting essentially of an aqueous solution of saccharide, and power means to produce a spark discharge (high power density arcs) in a gap between said electrode and an electrically conductive work piece, whereby spark discharges from said electrode are produced in a gap between said electrode and said work piece to machine said work piece when said device is used for electrospark machining.
Claim 4
Dependent Claim
91 words
An electrospark machining device comprising an electrospark machining electrode positioned in a non-flammable electrospark mmachining solution having an insulation resistance of at least 1×10 4 Ωcm, said solution consisting essentially of an aqueous solution of saccharide, and power means to produce a spark discharge (high power density arcs) in a gap between said electrode and an electrically conductive work piece, whereby spark discharges from said electrode are produced in a gap between said electrode and said work piece to machine said work piece when said device is used for electrospark machining.
Claim 5
Dependent Claim
33 words
The electrospark machining device as claimed in claim 1 or 2 in which said saccharide comprises at least one sugar selected from the group consisting of cane sugar, fruit sugar and malt sugar.
Claim 6
Dependent Claim
34 words
The electrospark machining device as claimed in claim 1 or 2 in which the amount of saccharide in said aqueous solution of saccharide is from 5 to 55% by weight of said aqueous solution.
Claim 7
Dependent Claim
18 words
The electrospark machining device as claimed in claim 1 or 2, said aqueous solution further comprising a preservative.
Claim 8
Dependent Claim
28 words
The electrospark machining device as claimed in claim 5 wherein said preservative is selected from the group consisting of benzoic acid, salicylic acid, dehydroacetic acid and ethyl para-hydroxybenzoate.
Claim 9
Dependent Claim
16 words
The electrospark machining device as claimed in claim 6 in which said preservative is alkyl para-hydroxybenzoate.
Claim 10
Dependent Claim
27 words
The electrospark machining device as claimed in claim 6 in which said preservative is ethyl para-hydroxybenzoate of 0.01 to 0.1% by weight of said nonflammable machining solution.
Claim 11
Dependent Claim
36 words
The electrospark machining device as claimed in claim 1 or 2 said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 12
Dependent Claim
31 words
The electrospark machining device as claimed in claim 1 or 2 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
Claim 13
Dependent Claim
32 words
The electrospark machining device as claimed in claim 3 in which the amount of saccharide in said aqueous solution of saccharide is from 5 to 55% by weight of said aqueous solution.
Claim 14
Dependent Claim
34 words
The electrospark machining device as claimed in claim 3 said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 15
Dependent Claim
34 words
The electrospark machining device as claimed in claim 5 said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 16
Dependent Claim
34 words
The electrospark machining device as claimed in claim 6 said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 17
Dependent Claim
34 words
The electrospark machining device as claimed in claim 7 further said aqueous solution comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 18
Dependent Claim
34 words
The electrospark machining device as claimed in claim 8 further said aqueous solution comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 19
Dependent Claim
29 words
The electrospark machining device as claimed in claim 3 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
Claim 20
Dependent Claim
29 words
The electrospark machining device as claimed in claim 5 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
Claim 21
Dependent Claim
29 words
The electrospark machining device as claimed in claim 6 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
Claim 22
Dependent Claim
29 words
The electrospark machining device as claimed in claim 7 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
Claim 23
Dependent Claim
80 words
A process comprising the steps of (a) disposing an electrically conductive workpiece to be machined in a non-flammable electrospark machining solution consisting essentially of an aqueous solution of saccharide and having a high electrical insulating characteristic, and (b) applying a sufficient electrical voltage between said workpiece and an electrode positioned in said electrospark machining solution to produce spark discharges (high power density arcs) from said electrode in a gap between said electrode and said workpiece to electrospark machine said workpiece.
Claim 24
Dependent Claim
80 words
A process comprising the steps of (a) disposing an electrically conductive workpiece to be machined in a non-flammable electrospark machining solution consisting essentially of an aqueous solution of saccharide and having a high electrical insulating characteristic, and (b) applying a sufficient electrical voltage between said workpiece and an electrode positioned in said electrospark machining solution to produce spark discharges (high power density arcs) from said electrode in a gap between said electrode and said workpiece to electrospark machine said workpiece.
Claim 25
Dependent Claim
85 words
A process comprising the steps of (a) disposing an electrically conductive workpiece to be machined in a non-flammmable electrospark machining solution having an insulation resistance of at least 1×10 4 Ωcm, said solution consisting essentially of an aqueous solution of saccharide, and (b) applying a sufficient electrical voltage between said workpiece and an electrode positioned in said electrospark machining solution to produce spark discharges (high power density arcs) from said electrode in a gap between said electrode and said workpiece to electrospark machine said workpiece.
Claim 26
Dependent Claim
85 words
A process comprising the steps of (a) disposing an electrically conductive workpiece to be machined in a non-flammmable electrospark machining solution having an insulation resistance of at least 1×10 4 Ωcm, said solution consisting essentially of an aqueous solution of saccharide, and (b) applying a sufficient electrical voltage between said workpiece and an electrode positioned in said electrospark machining solution to produce spark discharges (high power density arcs) from said electrode in a gap between said electrode and said workpiece to electrospark machine said workpiece.
Claim 27
Dependent Claim
31 words
The process as claimed in claim 21 or 22 in which said saccharide comprises at least one sugar selected from the group consisting of cane sugar, fruit sugar and malt sugar.
Claim 28
Dependent Claim
32 words
The process as claimed in claim 21 or 22 in which the amount of saccharide in said aqueous solution of saccharide is from 5 to 55% by weight of said aqueous solution.
Claim 29
Dependent Claim
16 words
The process as claimed in claim 11 or 22, said aqueous solution further comprising a preservative.
Claim 30
Dependent Claim
26 words
The process as claimed in claim 25 wherein said preservative is selected from the group consisting of benzoic acid, salicylic acid, dehydroacetic acid and ethyl para-hydroxybenzoate.
Claim 31
Dependent Claim
14 words
The process as claimed in claim 26 in which said preservative is alkyl para-hydroxybenzoate.
Claim 32
Dependent Claim
25 words
The process as claimed in claim 26 in which said preservative is ethyl para-hydroxybenzoate of 0.01 to 0.1% by weight of said nonflammable machining solution.
Claim 33
Dependent Claim
34 words
The process as claimed in claim 21 or 22, said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 34
Dependent Claim
29 words
The process as claimed in claim 21 or 22 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
Claim 35
Dependent Claim
30 words
The process as claimed in claim 23 in which the amount of saccharide in said aqueous solution of saccharide is from 5 to 55% by weight of said aqueous solution.
Claim 36
Dependent Claim
32 words
The process as claimed in claim 23, said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 37
Dependent Claim
32 words
The process as claimed in claim 25, said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 38
Dependent Claim
32 words
The process as claimed in claim 26, said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 39
Dependent Claim
32 words
The process as claimed in claim 27, said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 40
Dependent Claim
32 words
The process as claimed in claim 28 said aqueous solution further comprising an anticorrosive additive selected from the group consisting of sodium nitride, sodium polyphosphate, sodium dichromate, sodium silicate and triethanol amine.
Claim 41
Dependent Claim
27 words
The process as claimed in claim 23 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
Claim 42
Dependent Claim
27 words
The process as claimed in claim 25 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
Claim 43
Dependent Claim
27 words
The process as claimed in claim 26 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
Claim 44
Dependent Claim
27 words
The process as claimed in claim 27 further comprising an anticorrosive additive consisting of 0.05 to 0.1% by weight of said nonflammable machining solution of triethanol amine.
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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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |