Patent US2811941A successfully refreshed from Google Patents.
US2811941A
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Device for forming annular enlargements on hollow members
Assignee: BRILHART RES CORP
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Filing: 1951-12-07
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Granted: 1957-11-05
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Expires: 1971-12-07
Abstract
No abstract record available.
Inventors
- 👤 Julius M F Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:55
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/033; B21D26/045; B21D26/039
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US506247A
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US1111198A
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US1753680A
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US2206741A
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US2545570A
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US2407855A
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US2540688A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |