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Patent US2567413A successfully refreshed from Google Patents.
US2567413A
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Expulsion gap construction
Assignee: McGraw Electric Co
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Filing: 1947-12-05
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Granted: 1951-09-11
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Expires: 1967-12-05
Abstract
No abstract record available.
Inventors
- 👤 Anthony Van Ryan
- 👤 William R Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:58
CPC Classifications
H; H01; H01T; H01T1/00; H01T1/02; H01T1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US417694A
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US656680A
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US1548799A
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US1758181A
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US1872530A
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US1934454A
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US2108465A
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US2155841A
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GB528895A
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US2239940A
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US2333604A
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US2334727A
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US2414786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |