Patent US2273704A successfully refreshed from Google Patents.
US2797291A
Expired / Lapsed
US
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Control systems of the durationadjusting type
Assignee: Leeds and Northrup Co
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Filing: 1952-08-05
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Granted: 1957-06-25
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Expires: 1972-08-05
Abstract
No abstract record available.
Inventors
- 👤 Elwood T Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:42
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/22; G05D23/2236; G05D23/2237
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2268285A
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US2376488A
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US2495844A
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US2544031A
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US2499906A
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US2703679A
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US2651468A
Cited
US2688334A
Cited
US2651704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |