US2542931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair
Assignee: Individual
•
Filing: 1949-02-04
•
Granted: 1951-02-20
•
Expires: 1969-02-04
Abstract
No abstract record available.
Inventors
- 👤 Karl M Lightfoot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:46
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/02; A47C7/18; A47C7/20; Y; Y10; Y10S; Y10S297/00; Y10S297/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1231914A
Cited
US1687826A
Cited
US1802280A
Cited
GB373754A
Cited
AU1525333A
Cited
US2135657A
Cited
GB550424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |