US3615047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for separating scribed plates of brittle material
Assignee: AT&T Inc
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Filing: 1969-06-30
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Granted: 1971-10-26
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Expires: 1989-06-30
Abstract
Abstract APPARATUS FOR SEPARATING A SCRIBED PLATE OF BRITTLE MATERIAL UTILIZES TWO FLEXIBLE MEMBRANES BETWEEN WHICH THE PLATE IS VACUUM CLAMPED. A UNIFORM FORCE SUCH AS FLUID PRESSURE FORCES THE MEMBRANES INTO A DIE WHICH CAUSES THE MEMBRANES TO TRANSMIT UNIAXIAL STRESSES TO THE PLATE TO SEPARATE IT ALONG SCRIBE LINES. SEPARATION ALONG A SET OF SCRIBE LINES ORTHOGONAL TO THE FIRST SET IS ACHIEVED BY USING A DIE WHICH IS ORTHOGONAL TO THE FIRST DIE.
Inventors
- 👤 David Feldman
- 👤 John T Sibilia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:54
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0428; B; B28; B28D; B28D5/00; B28D5/0005; B28D5/0041; B28D5/0047; H10N; H10N97/00; H10P50/00; Y; Y10; Y10T; Y10T225/00; Y10T225/10; Y10T225/12; Y10T225/30; Y10T225/307; Y10T225/321; Y10T225/325
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |