Patent US3139770A successfully refreshed from Google Patents.
US2446484A
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Method of converting normal ammonium fluoride to ammonium bifluoride
Assignee: Individual
•
Filing: 1943-12-30
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Granted: 1948-08-03
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Expires: 1963-12-30
Abstract
No abstract record available.
Inventors
- 👤 Francis M Mcclenahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:09
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/16; C01C1/162
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1235552A
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US1402336A
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US1642788A
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GB265669A
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GB392631A
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US2003745A
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GB457155A
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US2156273A
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US2189173A
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US2234057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-03 | 1952-02-02 | 1952-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-03 | 1956-02-02 | 1956-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-03 | 1960-02-02 | 1960-08-03 | $7700.00 | Window Closed / Lapsed |