US2970828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cooling refractory particles
Assignee: Marblehead Lime Co
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Filing: 1955-02-10
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Granted: 1961-02-07
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Expires: 1975-02-10
Abstract
No abstract record available.
Inventors
- 👤 Lee H Niems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:39
CPC Classifications
F; F27; F27D; F27D15/00; F27D15/02; F27D15/0286
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |