US2582728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicator for the blind
Assignee: Individual
•
Filing: 1947-02-04
•
Granted: 1952-01-15
•
Expires: 1967-02-04
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:49
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/02; G01S17/04; Y; Y10; Y10S; Y10S367/00; Y10S367/909
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1820357A
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US2081134A
Cited
US1954204A
Cited
US2237193A
Cited
US2216716A
Cited
US2297534A
Cited
US2379496A
Cited
US2350820A
Cited
US2365580A
Cited
US2468042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-14 | 1955-07-16 | 1956-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-14 | 1959-07-16 | 1960-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-14 | 1963-07-16 | 1964-01-15 | $7700.00 | Window Closed / Lapsed |