US3421334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for separation of helium isotopes
Assignee: United States Atomic Energy Commission
•
Filing: 1966-08-10
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Granted: 1969-01-14
•
Expires: 1986-08-10
Abstract
No abstract record available.
Inventors
- 👤 John L Mckinney
- 👤 William L Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:54
CPC Classifications
B; B01; B01D; B01D59/00; B01D59/02; B01D59/04; Y; Y10; Y10S; Y10S62/00; Y10S62/919
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2460859A
Cited
US3299646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |