US3403974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for concentrating phosphoric acids containing impurities
Assignee: Armour Agricultural Chemical Co
•
Filing: 1964-03-25
•
Granted: 1968-10-01
•
Expires: 1984-03-25
Abstract
No abstract record available.
Inventors
- 👤 Jr William R Mustian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:45
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1264509A
Cited
US1924919A
Cited
US2338408A
Cited
US2830882A
Cited
US2962357A
Cited
US3057711A
Cited
US3104947A
Cited
US3193350A
Cited
US3192013A
Cited
US3316061A
Cited
US3266557A
Cited
US3279526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |