US2820859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for controlling operations at variable intervals
Assignee: Trianco Ltd
•
Filing: 1956-01-11
•
Granted: 1958-01-21
•
Expires: 1976-01-11
Abstract
No abstract record available.
Inventors
- 👤 Davies Charles William
- 👤 Pollard Leonard Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:22
CPC Classifications
H; H01; H01H; H01H43/00; G; G05; G05G; G05G21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US441973A
Cited
US1701399A
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US1701398A
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DE520644C
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FR741745A
Cited
US2090619A
Cited
US1906943A
Cited
DE611747C
Cited
US1962391A
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US2254509A
Cited
GB671568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |