US3438203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing hydrocarbons from salt caverns
Assignee: Shell USA Inc
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Filing: 1967-08-08
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Granted: 1969-04-15
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Expires: 1987-08-08
Abstract
No abstract record available.
Inventors
- 👤 Marcus J Lamb
- 👤 Harry William De Yarmett
- 👤 Clifford L Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:48
CPC Classifications
B; B65; B65G; B65G5/00; E; E21; E21B; E21B43/00; E21B43/34; E21B43/38
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) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |