Patent US3968199A successfully refreshed from Google Patents.
Patent US3409788A successfully refreshed from Google Patents.
US3409788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark suppressor for commutating electrical machines
Assignee: Associated Electrical Industries Ltd
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Filing: 1965-05-18
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Granted: 1968-11-05
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Expires: 1985-05-18
Abstract
No abstract record available.
Inventors
- 👤 Taylor Philip Lester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:41
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/18; H02K3/20; H02K3/12; H02K3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |