US2421171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antislip surface
Assignee: Heintz Manufacturing Co
•
Filing: 1944-10-30
•
Granted: 1947-05-27
•
Expires: 1964-10-30
Abstract
No abstract record available.
Inventors
- 👤 Trautvetter George
- 👤 Lambert Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:01
CPC Classifications
B; B61; B61D; B61D23/00; B63; B63B; B63B29/00; B63B29/02; B63B29/04; B63B29/06; B63B3/00; B63B3/14; B63B3/48; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496
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) | 1950-05-26 | 1950-11-25 | 1951-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-26 | 1954-11-25 | 1955-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-26 | 1958-11-25 | 1959-05-27 | $7700.00 | Window Closed / Lapsed |