US2528883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weight on bit indicator
Assignee: Individual
•
Filing: 1946-01-31
•
Granted: 1950-11-07
•
Expires: 1966-01-31
Abstract
No abstract record available.
Inventors
- 👤 John T Hayward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:54
CPC Classifications
G; G01; G01L; G01L5/00; G01L5/04; G01L5/08; E; E21; E21B; E21B47/00; E21B47/007; G01G; G01G19/00; G01G19/14; G01G19/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US507107A
Cited
US1622784A
Cited
US2133016A
Cited
US2109297A
Cited
US2235279A
Cited
US2309211A
Cited
US2298216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |