US2420112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making gratings having interlocked bars
Assignee: Individual
•
Filing: 1941-11-01
•
Granted: 1947-05-06
•
Expires: 1961-11-01
Abstract
No abstract record available.
Inventors
- 👤 Elmer W Utzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:52
CPC Classifications
B; B21; B21D; B21D47/00; B21D47/005; E; E04; E04C; E04C2/00; E04C2/30; E04C2/42; E04C2/421; E04C2/422; E04C2/423; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49616; Y10T29/4962
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2014451A
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US2162497A
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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) | 1950-05-05 | 1950-11-04 | 1951-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-05 | 1954-11-04 | 1955-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-05 | 1958-11-04 | 1959-05-06 | $7700.00 | Window Closed / Lapsed |