US2509431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispensing fluidized pulverulent materials
Assignee: Shawinigan Chemicals Ltd
•
Filing: 1949-07-14
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Granted: 1950-05-30
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Expires: 1969-07-14
Abstract
No abstract record available.
Inventors
- 👤 Ronald H Hall
- 👤 Douglas M Mckim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:38
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/0015; B01J8/002; B65; B65G; B65G53/00; B65G53/04; B65G53/16; B65G53/18; B65G53/22
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) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |