US3220938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxide underlay for printed circuit components
Assignee: AT&T Inc
•
Filing: 1961-03-09
•
Granted: 1965-11-30
•
Expires: 1981-03-09
Abstract
No abstract record available.
Inventors
- 👤 David A Mclean
- 👤 Doris S Nicodemus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:25
CPC Classifications
H; H01; H01G; H01G2/00; H01C; H01C17/00; H01G9/00; H01G9/004; H01G9/04; H01G9/042; H10; H10N; H10N97/00; Y; Y10; Y10T; Y10T29/00; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2148046A
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US2472304A
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US2607825A
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US2628927A
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US2719797A
Cited
US2812297A
Cited
US2886502A
Cited
US2958117A
Cited
GB845453A
Cited
US3035990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |