Patent US2821156A successfully refreshed from Google Patents.
US2821156A
Expired / Lapsed
US
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Die
Assignee: Individual
•
Filing: 1951-12-05
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Granted: 1958-01-28
•
Expires: 1971-12-05
Abstract
No abstract record available.
Inventors
- 👤 Lyon George Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:23
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/54; B21D22/00; B21D22/20; B21D22/28; B21D22/286; B21D37/00; B21D37/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US102468A
Cited
US216729A
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US348079A
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US361509A
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US1814600A
Cited
US1957234A
Cited
US2152842A
Cited
US2292669A
Cited
US2388948A
Cited
US2531663A
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 |