US2763972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for dust extraction and ventilation of grinding wheels
Assignee: British Cast Iron Research Association
•
Filing: 1953-03-13
•
Granted: 1956-09-25
•
Expires: 1973-03-13
Abstract
No abstract record available.
Inventors
- 👤 White William Holloran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:44
CPC Classifications
B; B24; B24B; B24B55/00; B24B55/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1308961A
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US673047A
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US787340A
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US1062248A
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US1912660A
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US2257832A
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GB524241A
Cited
US2225225A
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US2316476A
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US2499582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |