Patent US2966838A successfully refreshed from Google Patents.
US2966838A
Expired / Lapsed
US
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Venting unit
Assignee: OHIO FOUNDRY AND Manufacturing CO
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Filing: 1958-07-17
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Granted: 1961-01-03
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Expires: 1978-07-17
Abstract
No abstract record available.
Inventors
- 👤 Harry E Thompson
- 👤 Merl J Kimmel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:12
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/001; F24C15/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |