US2589304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking structural units
Assignee: Individual
•
Filing: 1947-07-29
•
Granted: 1952-03-18
•
Expires: 1967-07-29
Abstract
No abstract record available.
Inventors
- 👤 William B Spangler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:54
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/04; E04C3/06; E01; E01C; E01C9/00; E01C9/08; E01C9/083; E04C2/00; E04C2/30; E04C2/42; E04C2003/0404; E04C2003/0408; E04C2003/0413; E04C2003/0417; E04C2003/0421; E04C2003/0426; E04C2003/0434; E04C2003/0439; E04C2003/0443; E04C2003/0452; E04C2003/0465; Y; Y10; Y10T; Y10T428/00; Y10T428/16; Y10T428/163; Y10T428/164; Y10T428/166
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US645800A
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US1037099A
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US1030761A
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US1585003A
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US2020562A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |