US2609781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making expanded metal gratings
Assignee: AO Smith Corp
•
Filing: 1947-03-31
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Granted: 1952-09-09
•
Expires: 1967-03-31
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Gruetjen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:39
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/42; E04C2/427; B; B21; B21D; B21D47/00; B21D47/005; Y; Y10; Y10T; Y10T29/00; Y10T29/18; Y10T29/185; Y10T29/49; Y10T29/49616; Y10T29/4962
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1187043A
Cited
US1059710A
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US1983412A
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US2227874A
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US2214247A
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US2322965A
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US2326600A
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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) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |