US3361518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing heteropoly acids
Assignee: GTE Sylvania Inc
•
Filing: 1965-02-24
•
Granted: 1968-01-02
•
Expires: 1985-02-24
Abstract
No abstract record available.
Inventors
- 👤 Chiola Vincent
- 👤 Clarence D Vanderpool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:57
CPC Classifications
C; C01; C01G; C01G41/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2467523A
Cited
US2503991A
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US2744928A
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US3074820A
Cited
US3156644A
Cited
US3288562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |