US3948620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making cutting master for erosion machining
Assignee: Individual
•
Filing: 1973-09-14
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Granted: 1976-04-06
•
Expires: 1993-09-14
Abstract
Abstract A cutting master for total form abrasion machining a predetermined shape in a friable material including a body having a surface which is substantially the mirror image of a shape to be machined by abrasion, which surface is abrasive, is different in size from the shape to be abrasion machined by a predetermined amount, and includes a flat portion having a dimension related to the difference in size between the predetermined shape and the abrasive surface.
Inventors
- 👤 Thomas J. O'Connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:09
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
The method of forming an oversize cutting master for total form abrasion machining of a predetermined form in carbon or the like having a predetermined exact size comprising producing a surface on a body of rigid material which is substantially a mirror image of the predetermined form to be machined and oversize from said predetermined exact size by a predetermined exact amount and making the surface abrasive, wherein the cutting master is cast of a settable plastic having small particles of sand therein at the abrasive surface of the finished cutting master and the oversize cutting master is produced by orbiting a model of the form to be abrasion machined in the settable material while the settable material is setting.
Claim 2
Independent Claim
120 words
The method of forming an oversize cutting master for total form abrasion machining of a predetermined form in carbon or the like having a predetermined exact size comprising producing a surface on a body of rigid material which is substantially a mirror image of the predetermined form to be machined and oversize from said predetermined exact size by a predetermined exact amount and making the surface abrasive, wherein the cutting master is cast of a settable plastic having small particles of sand therein at the abrasive surface of the finished cutting master and the oversize cutting master is produced by orbiting a model of the form to be abrasion machined in the settable material while the settable material is setting.
References Cited (Backward Citations)
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US3288580A
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US3747281A
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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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |