Patent US2729437A successfully refreshed from Google Patents.
US2729437A
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US
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Apparatus for making cavities for pipes, electric wiring and switches in the masonry of houses and the like
Assignee: ANSBACHER MASCHINEN und WERKZE
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Filing: 1951-07-23
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Granted: 1956-01-03
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Expires: 1971-07-23
Abstract
No abstract record available.
Inventors
- 👤 Brenner Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:12
CPC Classifications
B; B28; B28D; B28D1/00; B28D1/18; B28D1/183
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US313577A
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US494368A
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US1768318A
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US1277573A
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US1386103A
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US1923159A
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US2238304A
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US2560352A
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US2569682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |