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Patent US3542431A successfully refreshed from Google Patents.
US3542431A
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Bacteriological mining of sulphur bearing deposits
Assignee: ARTHUR G DAVIDSON
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Filing: 1969-03-21
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Granted: 1970-11-24
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Expires: 1989-03-21
Abstract
No abstract record available.
Inventors
- 👤 Clarence J Johnson
- 👤 William G Mouat
- 👤 Arthur G Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:03
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/28; C; C09; C09K; C09K8/00; C09K8/52; C09K8/528; C09K8/532; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/17
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |