Patent US2347228A successfully refreshed from Google Patents.
US2347228A
Expired / Lapsed
US
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Method of producing anthracene
Assignee: Beazer East Inc
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Filing: 1941-05-28
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Granted: 1944-04-25
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Expires: 1961-05-28
Abstract
No abstract record available.
Inventors
- 👤 Winans Charles Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:29
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/14875; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/93; Y10S585/932
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) | 1947-04-25 | 1947-10-25 | 1948-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-04-25 | 1951-10-25 | 1952-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-04-25 | 1955-10-25 | 1956-04-25 | $7700.00 | Window Closed / Lapsed |