Patent US3511620A successfully refreshed from Google Patents.
US3511620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange method for separating uranium isotopes
Assignee: Individual
•
Filing: 1967-11-21
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Granted: 1970-05-12
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Expires: 1987-11-21
Abstract
No abstract record available.
Inventors
- 👤 Junichi Shimokawa
- 👤 Gunji Nishio
- 👤 Fumiaki Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:13
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/10; B01D; B01D59/00; B01D59/28; B01D59/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |