Patent US2311613A successfully refreshed from Google Patents.
Patent US2640501A successfully refreshed from Google Patents.
US2640501A
Expired / Lapsed
US
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Tube and its manufacture
Assignee: International Standard Electric Corp
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Filing: 1948-02-27
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Granted: 1953-06-02
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Expires: 1968-02-27
Abstract
No abstract record available.
Inventors
- 👤 Scott Thomas Robertson
- 👤 Weston William Kirby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:42
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/12; B21C37/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US9278A
Cited
US1566512A
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US1481341A
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US1586750A
Cited
US2039781A
Cited
GB520767A
Cited
US2247197A
Cited
US2354556A
Cited
US2446490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |