US3510256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali treatment of chromium ores
Assignee: Bayer AG
•
Filing: 1967-07-10
•
Granted: 1970-05-05
•
Expires: 1987-07-10
Abstract
No abstract record available.
Inventors
- 👤 Heinrich Schafer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:49
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/32; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US219637A
Cited
US3095266A
Cited
US1866648A
Cited
US1948143A
Cited
US1964719A
Cited
US2501952A
Cited
US2494215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-04 | 1973-11-03 | 1974-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-04 | 1977-11-03 | 1978-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-04 | 1981-11-03 | 1982-05-05 | $7700.00 | Window Closed / Lapsed |