Patent US2927260A successfully refreshed from Google Patents.
US2927260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static frequency-changing systems
Assignee: Individual
•
Filing: 1955-12-28
•
Granted: 1960-03-01
•
Expires: 1975-12-28
Abstract
No abstract record available.
Inventors
- 👤 Noah S Prywes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:56
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/02; H01F38/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1586885A
Cited
US1645303A
Cited
US1862211A
Cited
US2150386A
Cited
US2418642A
Cited
GB714146A
Cited
US2721304A
Cited
US2725520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |