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Patent US3418255A successfully refreshed from Google Patents.
US3418255A
Expired / Lapsed
US
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Method of producing concentrated solutions of mixed ammonium salts of boric, phosphoric and sulfuric acids
Assignee: Mississippi Chemical Corp
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Filing: 1967-04-28
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Granted: 1968-12-24
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Expires: 1987-04-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Marion L Brown
- 👤 Albert W Green
- 👤 Elmer L Blanton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:05
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/18; C05; C05B; C05B17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2657977A
Cited
US2902342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |