US3447381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sampling mechanism
Assignee: Commercial Testing & Eng Co
•
Filing: 1966-09-06
•
Granted: 1969-06-03
•
Expires: 1986-09-06
Abstract
No abstract record available.
Inventors
- 👤 Robert W Langtry
- 👤 Richard Shepherd
- 👤 Earl A Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:07
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/02; G; G01; G01N; G01N1/00; G01N1/02; G01N1/04; G01N1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1579970A
Cited
US1860107A
Cited
US1927871A
Cited
US2682772A
Cited
US2814204A
Cited
GB956716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |