US2609250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized conveyer for powdered material
Assignee: HANNAH JANE HAPMAN
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Filing: 1948-05-07
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Granted: 1952-09-02
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Expires: 1968-05-07
Abstract
No abstract record available.
Inventors
- 👤 Henry W Hapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:53
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/34; B65G53/40; B65G53/44
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) | 1955-09-02 | 1956-03-03 | 1956-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-02 | 1960-03-03 | 1960-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-02 | 1964-03-03 | 1964-09-02 | $7700.00 | Window Closed / Lapsed |