US2722647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor control system
Assignee: Westinghouse Electric Corp
•
Filing: 1950-10-27
•
Granted: 1955-11-01
•
Expires: 1970-10-27
Abstract
No abstract record available.
Inventors
- 👤 Walter H Esselman
- 👤 Alvin O Lund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:24
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/02; B66B1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1183881A
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US1488902A
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US1662084A
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US1989233A
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US2021753A
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US2331960A
Cited
US2555491A
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US2462751A
Cited
US2589277A
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US2610315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |