Patent US2975874A successfully refreshed from Google Patents.
US2975874A
Expired / Lapsed
US
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Girder made up of structural members
Assignee: Individual
•
Filing: 1959-03-25
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Granted: 1961-03-21
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Expires: 1979-03-25
Abstract
No abstract record available.
Inventors
- 👤 Pagan Alberto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:05
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/04; E04C3/06; E04C3/07; E04C2003/0404; E04C2003/0408; E04C2003/0413; E04C2003/0426; E04C2003/043; E04C2003/0443; E04C2003/0465
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US686817A
Cited
US1997876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |