Patent US4412375A successfully refreshed from Google Patents.
Patent US3525028A successfully refreshed from Google Patents.
US3525028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic control for the movement of large objects,particularly movable blackboards
Assignee: Individual
•
Filing: 1967-04-17
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Granted: 1970-08-18
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Expires: 1987-04-17
Abstract
No abstract record available.
Inventors
- 👤 Walter Ruoss
- 👤 Hans Jenny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:51
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/96; H03K17/9645; H02; H02P; H02P23/00; H02P23/24; H03K17/51; H03K17/56; H03K17/60; H03K17/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2576929A
Cited
US2946956A
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US3056907A
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US3020528A
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US3207905A
Cited
US3218530A
Cited
US3255380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |