Patent US2989716A successfully refreshed from Google Patents.
US2989716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconductive circuits
Assignee: International Business Machines Corp
•
Filing: 1959-12-21
•
Granted: 1961-06-20
•
Expires: 1979-12-21
Abstract
No abstract record available.
Inventors
- 👤 Andrew E Brennemann
- 👤 George J Kahan
- 👤 Robert T C Tsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:09
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/58; C23C14/5806; C23C14/04; C23C14/042; C23C14/044; C23C14/5873; C23F; C23F1/00; C23F1/02; G; G11; G11C; G11C11/00; G11C11/21; G11C11/44; H; H01; H01B; H01B1/00; H10; H10N; H10N60/00; H10N60/01; H10N60/30; H10N60/35; Y; Y10; Y10S; Y10S336/00; Y10S336/01; Y10S505/00; Y10S505/80; Y10S505/815; Y10S505/818; Y10S505/82; Y10S505/825; Y10S505/831; Y10S505/833; Y10S505/882; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24479; Y10T428/24488
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2849583A
Cited
US2832897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |