Patent US2537575A successfully refreshed from Google Patents.
US2537575A
Expired / Lapsed
US
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Screw and washer assembly
Assignee: Illinois Tool Works Inc
•
Filing: 1944-09-25
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Granted: 1951-01-09
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Expires: 1964-09-25
Abstract
No abstract record available.
Inventors
- 👤 Edmond C Crowther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:05
CPC Classifications
F; F16; F16B; F16B43/00; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/956; Y10S411/957; Y10S411/959
Claims Analysis
Total Claims: 0
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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) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |