Patent US2846931A successfully refreshed from Google Patents.
US2846931A
Expired / Lapsed
US
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Grating structure
Assignee: United States Steel Corp
•
Filing: 1953-11-12
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Granted: 1958-08-12
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Expires: 1973-11-12
Abstract
No abstract record available.
Inventors
- 👤 Henry M Priest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:06
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/42; E04C2/421; E04C2/422; E04C2/425
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US504924A
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US582386A
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US1034440A
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US1140657A
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US1868654A
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US1946035A
Cited
US2082197A
Cited
US2190214A
Cited
US2275104A
Cited
US2740335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |