US2590931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemically heated paraffin knife
Assignee: Sperry Sun Well Surveying Co
•
Filing: 1949-02-11
•
Granted: 1952-04-01
•
Expires: 1969-02-11
Abstract
No abstract record available.
Inventors
- 👤 Bert A Cabaniss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:47
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/008; E21B37/00; E21B37/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1303618A
Cited
US884675A
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US1379815A
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US1600577A
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US2035413A
Cited
US2035382A
Cited
US2094897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |