Patent US3403970A successfully refreshed from Google Patents.
US3403970A
Expired / Lapsed
US
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Process for preparing chromates
Assignee: Elkem Metals Co LP
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Filing: 1964-06-02
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Granted: 1968-10-01
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Expires: 1984-06-02
Abstract
No abstract record available.
Inventors
- 👤 James B Culbertson
- 👤 Lamprey Headlee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:52
CPC Classifications
C; C01; C01G; C01G37/00; C01G37/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3095266A
Cited
US1526325A
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US1700657A
Cited
US1955326A
Cited
US1935082A
Cited
GB496890A
Cited
US2400272A
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 |