US2506530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paraffin knife
Assignee: Individual
•
Filing: 1946-10-01
•
Granted: 1950-05-02
•
Expires: 1966-10-01
Abstract
No abstract record available.
Inventors
- 👤 Carroll C Westerman
- 👤 Granval W Westerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:40
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1814752A
Cited
US1989035A
Cited
US2058825A
Cited
US2184393A
Cited
US2203966A
Cited
US2214982A
Cited
US2326528A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-01 | 1953-10-31 | 1954-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-01 | 1957-10-31 | 1958-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-01 | 1961-10-31 | 1962-05-02 | $7700.00 | Window Closed / Lapsed |