Patent US2780936A successfully refreshed from Google Patents.
US2780936A
Expired / Lapsed
US
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Channel shaped anchor retaining strip for embedment in concrete
Assignee: Superior Concrete Accessories Inc
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Filing: 1951-01-29
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Granted: 1957-02-12
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Expires: 1971-01-29
Abstract
No abstract record available.
Inventors
- 👤 Hillberg Bror
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:45
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/38; E04B1/41; E04B1/4178; E04B1/4107
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2013736A
Cited
US1119435A
Cited
US1758989A
Cited
US1936223A
Cited
US1871976A
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US2115137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-12 | 1960-08-13 | 1961-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-12 | 1964-08-13 | 1965-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-12 | 1968-08-13 | 1969-02-12 | $7700.00 | Window Closed / Lapsed |