Patent US2641720A successfully refreshed from Google Patents.
US2641720A
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Electromagnetic vibrator
Assignee: WESTOOL Ltd
•
Filing: 1949-12-29
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Granted: 1953-06-09
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Expires: 1969-12-29
Abstract
No abstract record available.
Inventors
- 👤 Stewart Donald Arnott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:00
CPC Classifications
H; H02; H02K; H02K33/00; H02K33/02; H02K33/04; B; B06; B06B; B06B1/00; B06B1/02; B06B1/04; B06B1/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1847085A
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US1768718A
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US1928812A
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US2122888A
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US2211000A
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US2248110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |