US3821782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage semiconductor device with plural grooves
Assignee: Individual
•
Filing: 1973-09-04
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Granted: 1974-06-28
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Expires: 1993-09-04
Abstract
Abstract A SEMICONDUCTOR DEVICE THAT COMPRISES A BODY OF SEMICONDUCTOR MATERIAL HAVING FIRST AND SECOND CONTINUOUS GROOVES IN FIRST AND SECOND OPPOSITE SURFACES AT THE PERIPHERY THEREOF, RESPECTIVELY, IN WHICH THE COMBINED DEPTHS OF THE TWO GROOVES ARE SUBSTANTIALLY EQUAL TO OR GREATER THAN THE THICKNESS OF THE BODY BETWEEN THE OPPOSITE SURFACES. THE GROOVES ARE OFFSET OR LATERALLY SPACED APART, WITH THE SURFACES THEREOF BEING ETCHED SMOOTH SO THAT THE ELECTRIC FIELD IS NOT DISTORTED AT THE EDGE OF THE DEVICE.
Inventors
- 👤 J Hutson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:29
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/10; H10W74/131; H10D; H10D62/00; H10D62/10; H10D62/117; H10D99/00; H10W90/00; H10W90/701; H10W90/731; H10W90/736
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |