US3177337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical discharge machining of printed circuit boards
Assignee: AT&T Inc
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Filing: 1962-08-15
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Granted: 1965-04-06
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Expires: 1982-08-15
Abstract
No abstract record available.
Inventors
- 👤 Werner H Kohles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:15
CPC Classifications
B; B23; B23H; B23H1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
AN APPARATUS FOR FORMING A METAL PATTERN ON AN INSULATION BASE BY SPARK-EROSION PROCESS COMPRISING: AN ELECTRODE ROLLER HAVING LATERALLY DISPLACED PROJECTIONS FORMED IN A WELL-DEFINED PATTERN ON THE PERIPHERY THEREOF, A MASTER ROLLER HAVING A RECESSED LATERALLY DISPLACED PATTERN FORMED IN THE PERIPHERY THEREOF COINCIDENT WITH THE LATERALLY DISPLACED PATTERN FORMED ON THE ELECTRODE ROLLER, THE MASTER ROLLER POSITIONED ADJACENT TO THE ELECTRODE ROLLER SO THAT THE PROJECTIONS OF THE ELECTRODE ENGAGE AND ARE IMPRESSED IN THE LATERALLY DISPLACE RECESSED PATTERN FORMED IN THE MASTER ROLLER, MEANS FOR CONVEYING THE INSULATION BASE HAVING A METAL FOIL ON ONE SURFACE THEREOF SUBJACENT TO AND SPACED FROM THE PROJECTIONS OF THE ELECTRODE ROLLER SO THAT A SPARK GAP IS FORMED THEREBETWEEN, MEANS FOR APPLYING AN ELECTRICAL DISCHARGE POTENTIAL BETWEEN THE METAL FOIL AND THE LATERALLY DISPLACED PROJECTIONS OF THE ELECTRODE ROLLER SO THAT A SPARK IS DE-
Claim 2
Independent Claim
146 words
AN APPARATUS FOR FORMING A METAL PATTERN ON AN INSULATION BASE BY SPARK-EROSION PROCESS COMPRISING: AN ELECTRODE ROLLER HAVING LATERALLY DISPLACED PROJECTIONS FORMED IN A WELL-DEFINED PATTERN ON THE PERIPHERY THEREOF, A MASTER ROLLER HAVING A RECESSED LATERALLY DISPLACED PATTERN FORMED IN THE PERIPHERY THEREOF COINCIDENT WITH THE LATERALLY DISPLACED PATTERN FORMED ON THE ELECTRODE ROLLER, THE MASTER ROLLER POSITIONED ADJACENT TO THE ELECTRODE ROLLER SO THAT THE PROJECTIONS OF THE ELECTRODE ENGAGE AND ARE IMPRESSED IN THE LATERALLY DISPLACE RECESSED PATTERN FORMED IN THE MASTER ROLLER, MEANS FOR CONVEYING THE INSULATION BASE HAVING A METAL FOIL ON ONE SURFACE THEREOF SUBJACENT TO AND SPACED FROM THE PROJECTIONS OF THE ELECTRODE ROLLER SO THAT A SPARK GAP IS FORMED THEREBETWEEN, MEANS FOR APPLYING AN ELECTRICAL DISCHARGE POTENTIAL BETWEEN THE METAL FOIL AND THE LATERALLY DISPLACED PROJECTIONS OF THE ELECTRODE ROLLER SO THAT A SPARK IS DE-
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) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |