US3471390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina concentration meter
Assignee: Reynolds Metals Co
•
Filing: 1965-03-24
•
Granted: 1969-10-07
•
Expires: 1985-03-24
Abstract
No abstract record available.
Inventors
- 👤 Robert Milton Kibby
- 👤 Herbert Charles Marshall Jr
- 👤 Nolan Earle Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:22
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; C; C25; C25C; C25C3/00; C25C3/06; C25C3/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2208023A
Cited
US2773020A
Cited
US2933440A
Cited
US3067384A
Cited
US3329592A
Cited
US3317413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |