US2839253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In-line pneumatic-mechanical unit pulverizers
Assignee: Bituminous Coal Research Inc
•
Filing: 1955-01-12
•
Granted: 1958-06-17
•
Expires: 1975-01-12
Abstract
No abstract record available.
Inventors
- 👤 John I Yellott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:29
CPC Classifications
B; B02; B02C; B02C21/00; Y; Y10; Y10S; Y10S241/00; Y10S241/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US878878A
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US1446151A
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US2240269A
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US2155697A
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US2175457A
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US2314251A
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US2385508A
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US2651176A
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US2591141A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |