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Patent US2844023A successfully refreshed from Google Patents.
US2844023A
Expired / Lapsed
US
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Concrete joists
Assignee: Individual
•
Filing: 1957-09-26
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Granted: 1958-07-22
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Expires: 1977-09-26
Abstract
No abstract record available.
Inventors
- 👤 Paul S Maiwurm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:57
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/20; E04C3/26; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US710679A
Cited
FR609134A
Cited
GB273004A
Cited
US1818254A
Cited
US1949924A
Cited
US2062399A
Cited
US2075633A
Cited
US2271079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |