US3019536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway ballast equipment
Assignee: Kershaw Manufacturing Co Inc
•
Filing: 1957-07-19
•
Granted: 1962-02-06
•
Expires: 1977-07-19
Abstract
No abstract record available.
Inventors
- 👤 Kershaw John Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:42
CPC Classifications
E; E01; E01B; E01B27/00; E01B27/02; E01B27/023; E01B27/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US595202A
Cited
US1170269A
Cited
US1371839A
Cited
US1470058A
Cited
US1755695A
Cited
US2583378A
Cited
US2861359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |