US3521091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconducting apparatus
Assignee: Individual
•
Filing: 1965-10-01
•
Granted: 1970-07-21
•
Expires: 1985-10-01
Abstract
No abstract record available.
Inventors
- 👤 Edward Halas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:44
CPC Classifications
H; H02; H02K; H02K55/00; H02K55/02; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1386524A
Cited
FR894422A
Cited
US3098189A
Cited
US3239697A
Cited
US3320443A
Cited
US3242418A
Cited
US3205413A
Cited
US3283276A
Cited
US3368087A
Cited
US3320454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |