US2684869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Handling pulverulent materials
Assignee: Dorr Co
•
Filing: 1951-05-21
•
Granted: 1954-07-27
•
Expires: 1971-05-21
Abstract
No abstract record available.
Inventors
- 👤 Walter C Lapple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:12
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/34; B65G53/60; B65G2812/00; B65G2812/16; B65G2812/1608; B65G2812/1616; B65G2812/1625
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US494274A
Cited
US1032115A
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GB180397A
Cited
US1846069A
Cited
US1935843A
Cited
US1880452A
Cited
US2609249A
Cited
US2576504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |