Patent US2840797A successfully refreshed from Google Patents.
US2840797A
Expired / Lapsed
US
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Supervisory control systems and apparatus
Assignee: Westinghouse Electric Corp
•
Filing: 1952-08-14
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Granted: 1958-06-24
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Expires: 1972-08-14
Abstract
No abstract record available.
Inventors
- 👤 Willard A Derr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:11
CPC Classifications
H; H04; H04Q; H04Q9/00; H04Q9/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1702423A
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US1476003A
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US2300935A
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US2289517A
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US2383328A
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US2397088A
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US2345951A
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US2429131A
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US2479701A
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US2399738A
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US2394971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |