US2559720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for treating gases
Assignee: Fansteel Inc
•
Filing: 1948-01-08
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Granted: 1951-07-10
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Expires: 1968-01-08
Abstract
No abstract record available.
Inventors
- 👤 Frederick L Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:01
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0053; B01J19/006; B01J10/00; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/00761; B01J2219/00763; B01J2219/00765; B01J2219/00768
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) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |