Patent US3539873A successfully refreshed from Google Patents.
US3539873A
Expired / Lapsed
US
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Matrix board apparatus
Assignee: IXYS Integrated Circuits Division Inc
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Filing: 1967-10-19
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Granted: 1970-11-10
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Expires: 1987-10-19
Abstract
No abstract record available.
Inventors
- 👤 Roger L Rosenberg
- 👤 Robert D Zielinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:58
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/08; H; H05; H05K; H05K1/00; H05K1/02; H05K1/0286; H05K1/0287; H05K1/0289
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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |