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Patent US2821233A successfully refreshed from Google Patents.
US2821233A
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Safety edge forming apparatus
Assignee: AT&T Inc
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Filing: 1955-01-25
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Granted: 1958-01-28
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Expires: 1975-01-25
Abstract
No abstract record available.
Inventors
- 👤 Wahl Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:13
CPC Classifications
B; B21; B21D; B21D19/00; B21D19/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US354654A
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US616642A
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GB189717945A
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US890500A
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US1262855A
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US1341589A
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US1692033A
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US1854630A
Cited
US2339032A
Cited
US2681027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |