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US2477404A
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Assignee: Individual
•
Filing: 1946-09-20
•
Granted: 1949-07-26
•
Expires: 1966-09-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Earl A Butt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:51
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/01; B01D29/05; B01D29/055; Y; Y10; Y10S; Y10S210/00; Y10S210/08
Claims Analysis
Total Claims: 0
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US2322428A
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US2328436A
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US2460423A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-25 | 1953-01-24 | 1953-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-25 | 1957-01-24 | 1957-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-25 | 1961-01-24 | 1961-07-26 | $7700.00 | Window Closed / Lapsed |