US2690693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fastener with expanding spring gripping means
Assignee: Individual
•
Filing: 1950-09-07
•
Granted: 1954-10-05
•
Expires: 1970-09-07
Abstract
No abstract record available.
Inventors
- 👤 Maxwell S Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:31
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/0026; Y; Y10; Y10T; Y10T403/00; Y10T403/60; Y10T403/602
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US860430A
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US900318A
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US1212298A
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US1268828A
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US1648855A
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US1631044A
Cited
GB408608A
Cited
US2542579A
Cited
GB608233A
Cited
US2520232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |