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US2018636A
Expired / Lapsed
US
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Hopper construction
Assignee: BEAUMONT BIRCH CO
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Filing: 1934-03-22
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Granted: 1935-10-22
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Expires: 1954-03-22
Abstract
No abstract record available.
Inventors
- 👤 William G Davenport
- 👤 Joseph K Weniger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:19
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/54; B65D90/58; B65D90/587
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1938-10-21 | 1939-04-22 | 1939-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-10-21 | 1943-04-22 | 1943-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-10-21 | 1947-04-22 | 1947-10-22 | $7700.00 | Window Closed / Lapsed |