US3515156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High lift mud hopper
Assignee: Atlantic Richfield Co
•
Filing: 1967-08-30
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Granted: 1970-06-02
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Expires: 1987-08-30
Abstract
No abstract record available.
Inventors
- 👤 Frank J Schuh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:13
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/062; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T137/8593; Y10T137/87571; Y10T137/87587; Y10T137/87619; Y10T137/87627
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |