US2552711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sole to permit circulation of air in rubber footwear
Assignee: Individual
•
Filing: 1949-09-22
•
Granted: 1951-05-15
•
Expires: 1969-09-22
Abstract
No abstract record available.
Inventors
- 👤 Dunker Martha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:45
CPC Classifications
A; A43; A43B; A43B7/00; A43B7/06; A43B7/08; A43B7/081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US426495A
Cited
GB105616A
Cited
US1335273A
Cited
US1469291A
Cited
US1660698A
Cited
US2190802A
Cited
US2480035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |