US2819846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of and apparatus for separating asbestos fibre from rock and for cleaning the fibre
Assignee: Individual
•
Filing: 1954-02-15
•
Granted: 1958-01-14
•
Expires: 1974-02-15
Abstract
No abstract record available.
Inventors
- 👤 Charles V Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:39
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US457923A
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US1317852A
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US922246A
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FR411485A
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US2292852A
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US2474314A
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GB674861A
Cited
US2679933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |