Patent US2801420A successfully refreshed from Google Patents.
US2801420A
Expired / Lapsed
US
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Protective apparatus for workmen
Assignee: CHICAGO EYE SHIELD CO
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Filing: 1954-03-11
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Granted: 1957-08-06
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Expires: 1974-03-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert Malcom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:40
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/04; A61F9/06; A42; A42B; A42B3/00; A42B3/04; A42B3/18; A42B3/22; A42B3/225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |