Patent US2719931A successfully refreshed from Google Patents.
US2719931A
Expired / Lapsed
US
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Permanent magnet field generators
Assignee: Individual
•
Filing: 1951-03-17
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Granted: 1955-10-04
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Expires: 1971-03-17
Abstract
No abstract record available.
Inventors
- 👤 Kober William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:13
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/24; H02K21/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US271979A
Cited
US496514A
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US1359333A
Cited
GB288232A
Cited
DE516221C
Cited
GB321549A
Cited
US2059518A
Cited
CH235423A
Cited
US2488437A
Cited
US2493102A
Cited
US2475776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |