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Patent US2973993A successfully refreshed from Google Patents.
US2973993A
Expired / Lapsed
US
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Apparatus for feeding solids
Assignee: Celanese Corp
•
Filing: 1958-03-25
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Granted: 1961-03-07
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Expires: 1978-03-25
Abstract
No abstract record available.
Inventors
- 👤 Carl R Delagrange
- 👤 Gerard F Meehan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:48
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/14; B04C5/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1468966A
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US1505188A
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US1495479A
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US1889176A
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GB393280A
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US2127693A
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US2311773A
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US2321015A
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US2404884A
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US2639862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |