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US2744590A
Expired / Lapsed
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Load-supporting structures
Assignee: Individual
•
Filing: 1950-12-12
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Granted: 1956-05-08
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Expires: 1970-12-12
Abstract
No abstract record available.
Inventors
- 👤 Alfred M Butts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:03
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/02; E04B5/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US621672A
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US998479A
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US1678435A
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US1958296A
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US2084649A
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US2321566A
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US2224499A
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US2291014A
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US2534852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |