US2918260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core drill construction
Assignee: Individual
•
Filing: 1957-04-29
•
Granted: 1959-12-22
•
Expires: 1977-04-29
Abstract
No abstract record available.
Inventors
- 👤 Carl V Tilden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:30
CPC Classifications
B; B28; B28D; B28D1/00; B28D1/02; B28D1/04; B28D1/041; B23; B23Q; B23Q1/00; B23Q1/0009; B23Q1/0018; B23Q1/0027; B23Q1/0036; E; E21; E21B; E21B21/00; E21B21/01; E21B21/015
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1250103A
Cited
US1891953A
Cited
US2079417A
Cited
US2124609A
Cited
US2310288A
Cited
US2339324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |