US2637539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distribution of solids in air
Assignee: Individual
•
Filing: 1949-04-01
•
Granted: 1953-05-05
•
Expires: 1969-04-01
Abstract
No abstract record available.
Inventors
- 👤 John M Crom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:43
CPC Classifications
E; E04; E04F; E04F21/00; E04F21/02; E04F21/06; E04F21/08; E04F21/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US528417A
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US603076A
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US1494669A
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US1731953A
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US1953091A
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US2075867A
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US2087464A
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US2231489A
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US2264108A
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US2299565A
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US2419410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |