Patent US2797623A successfully refreshed from Google Patents.
US2797623A
Expired / Lapsed
US
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Broke disposal units for papermaking machines
Assignee: Library and Archives Canada
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Filing: 1954-10-25
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Granted: 1957-07-02
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Expires: 1974-10-25
Abstract
No abstract record available.
Inventors
- 👤 Stewart Alexander Eric
- 👤 Stanley C Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:25
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US668068A
Cited
US724732A
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US1541928A
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US1818719A
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US1928601A
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US1960106A
Cited
AU126540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |