Patent US2981981A successfully refreshed from Google Patents.
US2981981A
Expired / Lapsed
US
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Method of making circuit panels
Assignee: International Business Machines Corp
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Filing: 1953-04-13
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Granted: 1961-05-02
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Expires: 1973-04-13
Abstract
No abstract record available.
Inventors
- 👤 Hans P Luhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:02
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/14; H05K3/107; H05K3/40; H05K3/4038; H05K3/4076; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0364; H05K2201/0376; H05K2203/00; H05K2203/02; H05K2203/0278; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155
Claims Analysis
Total Claims: 0
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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) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |