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Patent US2391484A successfully refreshed from Google Patents.
US2391484A
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Apparatus for treating ammonium sulphate crystals
Assignee: Beazer East Inc
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Filing: 1940-08-03
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Granted: 1945-12-25
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Expires: 1960-08-03
Abstract
No abstract record available.
Inventors
- 👤 Seymour William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:17
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/24; C01C1/249; F; F26; F26B; F26B17/00; F26B17/10; F26B17/101
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-12-24 | 1949-06-25 | 1949-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-24 | 1953-06-25 | 1953-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-24 | 1957-06-25 | 1957-12-25 | $7700.00 | Window Closed / Lapsed |