Patent US2674784A successfully refreshed from Google Patents.
US2674784A
Expired / Lapsed
US
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Commutator
Assignee: Watliff Co Ltd
•
Filing: 1951-04-25
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Granted: 1954-04-13
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Expires: 1971-04-25
Abstract
No abstract record available.
Inventors
- 👤 Roberts Llewellyn George
- 👤 Webb Walter Henry
- 👤 Ramsey John Lawton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:18
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/06; H01R43/08; Y; Y10; Y10S; Y10S200/00; Y10S200/07; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US435504A
Cited
US1195861A
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US1284362A
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US1233764A
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US1768651A
Cited
US1845115A
Cited
US2061821A
Cited
US2141268A
Cited
US2251326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |