US2421891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite billet and manufacture thereof
Assignee: Superior Steel Corp
•
Filing: 1943-03-18
•
Granted: 1947-06-10
•
Expires: 1963-03-18
Abstract
No abstract record available.
Inventors
- 👤 Walter L Keene
- 👤 William A Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:22
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49947; Y10T29/49954; Y10T29/49966; Y10T29/49968; Y10T428/00; Y10T428/12; Y10T428/12306; Y10T428/12313; Y10T428/12354; Y10T428/12493; Y10T428/12771; Y10T428/12778
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US346661A
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US685758A
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US729113A
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US785979A
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US976455A
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US1956818A
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US1886615A
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US2018725A
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US2145248A
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US2059584A
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US2131115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-09 | 1950-12-09 | 1951-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-09 | 1954-12-09 | 1955-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-09 | 1958-12-09 | 1959-06-10 | $7700.00 | Window Closed / Lapsed |