US2921207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamo electric machines
Assignee: Individual
•
Filing: 1956-06-26
•
Granted: 1960-01-12
•
Expires: 1976-06-26
Abstract
No abstract record available.
Inventors
- 👤 Fletcher Helen Gordon
- 👤 Fletcher Alfred Lantham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:01
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1306625A
Cited
US1677007A
Cited
US1345484A
Cited
US2182654A
Cited
US2201845A
Cited
US2743508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |