US3397956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing phosphoric acid
Assignee: ChampionX LLC
•
Filing: 1966-07-28
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Granted: 1968-08-20
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Expires: 1986-07-28
Abstract
No abstract record available.
Inventors
- 👤 William T Buchanan
- 👤 Charles R Hedenstad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:34
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/2343; C01B25/2346; C01B25/22; C01B25/222; C01B25/223
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) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |