US2968866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing thin wafers of semiconductor materials
Assignee: GTE Sylvania Inc
•
Filing: 1958-05-21
•
Granted: 1961-01-24
•
Expires: 1978-05-21
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Soper
- 👤 James J Doherty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:21
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0428; H10P95/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/49798; Y10T29/4981; Y10T29/49812; Y10T83/00; Y10T83/04; Y10T83/0405
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
THE METHOD OF PRODUCING THIN, FLAT WAFERS FROM AN INGOT OF SEMICONDUCTOR MATERIAL INCLUDING THE STEPS OF COATING AN INGOT WITH A LAYER OF CURABLE PLASTIC MATERIAL CONTAINING A MOISTURE ABSORBING CONSTITUTENT, CURING SAID LAYER OF PLASTIC MATERIAL TO A WATER-INSOLUBLE CONDITION IN SITU ON SAID SURFACE, REPEATEDLY CUTTING THROUGH THE COATED INGOT PARALLEL TO AN END FACE OF THE INGOT TO SEPARATE INDIVIDUAL COATED WAFERS FROM THE INGOT, EXPOSING THE COATED WAFERS TO MOISTURE TO EXPAND THE LAYER OF PLASTIC ON EACH WAFER, AND SUBSEQUENTLY SEPARATING THE LAYER OF PLASTIC FROM EACH WAFER.
Claim 2
Independent Claim
94 words
THE METHOD OF PRODUCING THIN, FLAT WAFERS FROM AN INGOT OF SEMICONDUCTOR MATERIAL INCLUDING THE STEPS OF COATING AN INGOT WITH A LAYER OF CURABLE PLASTIC MATERIAL CONTAINING A MOISTURE ABSORBING CONSTITUTENT, CURING SAID LAYER OF PLASTIC MATERIAL TO A WATER-INSOLUBLE CONDITION IN SITU ON SAID SURFACE, REPEATEDLY CUTTING THROUGH THE COATED INGOT PARALLEL TO AN END FACE OF THE INGOT TO SEPARATE INDIVIDUAL COATED WAFERS FROM THE INGOT, EXPOSING THE COATED WAFERS TO MOISTURE TO EXPAND THE LAYER OF PLASTIC ON EACH WAFER, AND SUBSEQUENTLY SEPARATING THE LAYER OF PLASTIC FROM EACH WAFER.
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) | 1964-01-24 | 1964-07-25 | 1965-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-24 | 1968-07-25 | 1969-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-24 | 1972-07-25 | 1973-01-24 | $7700.00 | Window Closed / Lapsed |