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US2981223A
Expired / Lapsed
US
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Dual air doctor for paper coating machines
Assignee: HOWARD SMITH PAPER MILLS Ltd
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Filing: 1960-03-31
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Granted: 1961-04-25
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Expires: 1980-03-31
Abstract
No abstract record available.
Inventors
- 👤 Edward P Olszowka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:07
CPC Classifications
B; B05; B05C; B05C11/00; B05C11/02; B05C11/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2766720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |