Patent US2779375A successfully refreshed from Google Patents.
US2779375A
Expired / Lapsed
US
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Split washer having one helical margin and one planar margin adapted to be secured to threaded fastener
Assignee: Illinois Tool Works Inc
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Filing: 1955-05-04
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Granted: 1957-01-29
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Expires: 1975-05-04
Abstract
No abstract record available.
Inventors
- 👤 John B O'connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:48
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/24; F16B39/26; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/956; Y10S411/957; Y10S411/958; Y10S411/959
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US329738A
Cited
US517185A
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US1611210A
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GB331682A
Cited
US1847314A
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US1883068A
Cited
US1966427A
Cited
US2424208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |