Patent US2427918A successfully refreshed from Google Patents.
US2427918A
Expired / Lapsed
US
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Industrial eyeshield
Assignee: CHICAGO EYE SHIELD CO
•
Filing: 1943-07-03
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Granted: 1947-09-23
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Expires: 1963-07-03
Abstract
No abstract record available.
Inventors
- 👤 Robert L Malcom
- 👤 Willis Z Whipple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:41
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/02; A61F9/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1243820A
Cited
GB290771A
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GB320755A
Cited
FR684750A
Cited
US1963437A
Cited
US2015475A
Cited
US2068849A
Cited
US2182104A
Cited
US2194192A
Cited
US2274791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-22 | 1951-03-24 | 1951-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-22 | 1955-03-24 | 1955-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-22 | 1959-03-24 | 1959-09-23 | $7700.00 | Window Closed / Lapsed |