US3900975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic grinding of copper
Assignee: Praxair Technology Inc
•
Filing: 1974-05-20
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Granted: 1975-08-26
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Expires: 1994-05-20
Abstract
Abstract A process for abrasively grinding copper comprising (1) cooling the entire copper workpiece to a cryogenic temperature and (2) abrasively grinding the copper workpiece while it is at said cryogenic temperature. The workpiece is preferably immersed in liquid N2 during the abrasive grinding thereby preventing adhesive wear from occurring at relatively high metal removal rates.
Inventors
- 👤 John Bernard Lightstone
- 👤 Richard Benedict Mazzarella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:23
CPC Classifications
B; B24; B24B; B24B55/00; B24B55/02; B24B1/00; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0405; Y10T83/041; Y10T83/283
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
A process for abrasively grinding copper comprising the steps of: 1. cooling the intended copper workpiece to a cryogenic temperature such that substantially the entire workpiece is at said cryogenic temperature, and 2. abrasively grinding said copper workpiece while at said cryogenic temperature thereby minimizing the tendency of the copper chips removed during abrasion to weld to the grinding surface.
Claim 2
Dependent Claim
60 words
A process for abrasively grinding copper comprising the steps of: 1. cooling the intended copper workpiece to a cryogenic temperature such that substantially the entire workpiece is at said cryogenic temperature, and 2. abrasively grinding said copper workpiece while at said cryogenic temperature thereby minimizing the tendency of the copper chips removed during abrasion to weld to the grinding surface.
Claim 3
Dependent Claim
21 words
The process as in claim 1 wherein said workpiece is cooled by immersing substantially the entire workpiece in a cryogenic fluid.
Claim 4
Dependent Claim
27 words
abrasively grinding said copper workpiece while at said cryogenic temperature thereby minimizing the tendency of the copper chips removed during abrasion to weld to the grinding surface.
Claim 5
Dependent Claim
27 words
abrasively grinding said copper workpiece while at said cryogenic temperature thereby minimizing the tendency of the copper chips removed during abrasion to weld to the grinding surface.
Claim 6
Dependent Claim
13 words
The process as in claim 1 wherein said cryogenic fluid is liquid N2.
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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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |