Patent US2993432A successfully refreshed from Google Patents.
US2993432A
Expired / Lapsed
US
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Calender air doctor
Assignee: Beloit Iron Works Inc
•
Filing: 1958-01-14
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Granted: 1961-07-25
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Expires: 1978-01-14
Abstract
No abstract record available.
Inventors
- 👤 Casper E Youngchild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:21
CPC Classifications
D; D21; D21F; D21F7/00; D21F7/06; D21G; D21G3/00; D21G3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US485534A
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US600518A
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US1326615A
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US680135A
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US1714261A
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US1982571A
Cited
US2130241A
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US2184908A
Cited
US2190941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |