Patent US2557631A successfully refreshed from Google Patents.
US2557631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible form for forming window or door openings in concrete walls
Assignee: Individual
•
Filing: 1948-06-12
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Granted: 1951-06-19
•
Expires: 1968-06-12
Abstract
No abstract record available.
Inventors
- 👤 Patrick J Callan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:58
CPC Classifications
E; E04; E04G; E04G15/00; E04G15/02; Y; Y10; Y10S; Y10S425/00; Y10S425/012
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1326251A
Cited
US888334A
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US1024646A
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US1041367A
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US1061918A
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US1387790A
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US1400751A
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US1863549A
Cited
US1851399A
Cited
US2321277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |