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US2575311A
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US
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Spring threaded bolt fastening device
Assignee: South Chester Corp
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Filing: 1949-11-14
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Granted: 1951-11-13
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Expires: 1969-11-14
Abstract
No abstract record available.
Inventors
- 👤 Jr John K Barry
- 👤 Jr William C Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:43
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/12; Y; Y10; Y10T; Y10T403/00; Y10T403/71; Y10T403/7123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US271929A
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US561579A
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US809880A
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DE436762C
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US1062635A
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FR428122A
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US1343733A
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US2113789A
Cited
US2470927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |