US2664534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable speed alternating current motor
Assignee: D ROBERT LAUGHTER
•
Filing: 1950-01-20
•
Granted: 1953-12-29
•
Expires: 1970-01-20
Abstract
No abstract record available.
Inventors
- 👤 Noodleman Samuel
- 👤 Arthur G Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:18
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/16; H02P25/18; H02P25/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL42699C
Cited
US1719889A
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US730108A
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US733341A
Cited
US882581A
Cited
US1356983A
Cited
US1478012A
Cited
DE631869C
Cited
US2196402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |