Patent US3797140A successfully refreshed from Google Patents.
Patent US3708422A successfully refreshed from Google Patents.
US3708422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric discharge machining fluid
Assignee: Citgo Petroleum Corp
•
Filing: 1971-01-29
•
Granted: 1973-01-02
•
Expires: 1991-01-29
Abstract
Abstract An improved electric discharge machining fluid permitting rapid removal of metal, particularly in the case of difficulty machined cast iron. The electric discharge machining fluid comprises a major proportion of an oil and a minor proportion of an oilsoluble aliphatic amine containing about 10 to 50 carbons. The preferred electric discharge machining fluid comprises a hydrocarbon oil and an oil-soluble aliphatic primary monoamine containing about 12 to 25 carbons.
Inventors
- 👤 J Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:57
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; B; B23; B23H; B23H1/00; B23H1/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
12 words
The process of claim 1 wherein the oil is a hydrocarbon oil.
Claim 2
Dependent Claim
14 words
The process of claim 2 wherein the amine has about 12 to 25 carbons.
Claim 3
Dependent Claim
12 words
The process of claim 3 wherein the amine is a primary monoamine.
Claim 4
Dependent Claim
17 words
The process of claim 4 wherein the composition contains in addition an antioxidant and a metal deactivator.
Claim 5
Dependent Claim
66 words
The process of claim 1 wherein the electric discharge machining fluid composition comprises a major proportion of a hydrocarbon oil; about 0.05 to 2.0 weight percent based on the overall composition of 2,6-di-tert-butyl-4-methylphenol; about 0.001 to 0.1 weight percent based on the overall composition of N,N''disalicylidine-1,2-propanediamine; and about 0.001 to 1.0 weight percent based on the overall composition of a mixture of hexadecylamine, octadecylamine, and octadecenylamine.
Claim 6
Dependent Claim
71 words
The process of claim 1 wherein the electric discharge machining fluid composition comprises a major proportion of a paraffinic hydrocarbon oil having a viscosity of about 35-50 SUS at 100* F; about 0.3 weight percent based on the overall composition of 2,6-di-tert-butyl-4-methyl-phenol; about 0.05 weight percent based on the overall composition of N,N''-disalicylidine-1,2-propanediamine; and about 0.8 weight percent based on the overall composition of a mixture of hexadecylamine, octadecylamine, and octadecenylamine.
References Cited (Backward Citations)
US1888023A
Cited
US2234096A
Cited
US2758086A
Cited
US2832741A
Cited
US3047501A
Cited
US3043783A
Cited
US3493512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |