Patent US3550112A successfully refreshed from Google Patents.
US3550112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state sign system
Assignee: Watchfire Signs LLC
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Filing: 1968-09-27
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Granted: 1970-12-22
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Expires: 1988-09-27
Abstract
No abstract record available.
Inventors
- 👤 Edward J Schulenberg Sr
- 👤 Ervin M Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:27
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/004; H; H05; H05B; H05B39/00; H05B39/04; H05B39/08; H05B39/081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1974318A
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US1946297A
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US2123459A
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US3084338A
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US3166742A
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US3384888A
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US3389389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |