Patent US3487268A successfully refreshed from Google Patents.
US3487268A
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Electric resistance matrixes for code conversion
Assignee: ADDO AB
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Filing: 1968-04-22
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Granted: 1969-12-30
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Expires: 1988-04-22
Abstract
No abstract record available.
Inventors
- 👤 Stig Helge Lennart Ljungdell
- 👤 Karl-Birger Uvelius
- 👤 Karl-Erik Berntson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:23
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/16; H05K1/167; G; G11; G11C; G11C17/00; H02; H02B; H02B1/00; H02B1/20; H02B1/207; H05K1/02; H05K1/0286; H05K1/0287; H05K1/0289; H05K1/11; H05K1/115; H05K1/116; H05K2201/00; H05K2201/09; H05K2201/09209; H05K2201/095; H05K2201/09609; H05K3/00; H05K3/40; H05K3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2870400A
Cited
US3372309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |