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US2816702A
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Assignee: National Research Corp
•
Filing: 1953-01-16
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Granted: 1957-12-17
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Expires: 1973-01-16
Abstract
No abstract record available.
Inventors
- 👤 Robert R Woodcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:49
CPC Classifications
F; F04; F04C; F04C27/00; F04C27/02; Y; Y10; Y10S; Y10S417/00; Y10S417/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US763525A
Cited
US1153874A
Cited
US1660563A
Cited
US1676783A
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US2455297A
Cited
US2465887A
Cited
US2669189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |