US3393975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of alumina-containing material for the manufacture of aluminum sulfate
Assignee: Pennsylvania Electric Co
•
Filing: 1966-05-20
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Granted: 1968-07-23
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Expires: 1986-05-20
Abstract
No abstract record available.
Inventors
- 👤 David R Mitchell
- 👤 Harold L Lovell
- 👤 Sun Shiou-Chuan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:46
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/68; C01F7/74; C01F7/743
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1529035A
Cited
US1815888A
Cited
US1945172A
Cited
US1873642A
Cited
US1964382A
Cited
US2743999A
Cited
US3143392A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |