US2986644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single crystal photovoltaic cell
Assignee: International Business Machines Corp
•
Filing: 1958-12-30
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Granted: 1961-05-30
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Expires: 1978-12-30
Abstract
No abstract record available.
Inventors
- 👤 Cheroff George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:08
CPC Classifications
H; H10; H10F; H10F77/00; H10F77/40; H10F77/407; H10F99/00; G; G02; G02B; G02B27/00; G02B27/28; H10F10/00; H10F10/10; H10P; H10P95/00; Y; Y02; Y02E; Y02E10/00; Y02E10/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |