Patent US2431287A successfully refreshed from Google Patents.
US2431287A
Expired / Lapsed
US
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Knee protector
Assignee: Individual
•
Filing: 1946-01-04
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Granted: 1947-11-18
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Expires: 1966-01-04
Abstract
No abstract record available.
Inventors
- 👤 Robert A Washington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:58
CPC Classifications
A; A41; A41D; A41D13/00; A41D13/05; A41D13/06; A41D13/065; A41D13/055; A41D13/0556; A41D13/0568
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) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |