Patent US3517815A successfully refreshed from Google Patents.
US3517815A
Expired / Lapsed
US
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Replenishment tanks
Assignee: R B BOLTON MINING ENG Ltd
•
Filing: 1968-07-15
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Granted: 1970-06-30
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Expires: 1988-07-15
Abstract
No abstract record available.
Inventors
- 👤 Robert Benjamin Bolton
- 👤 Thomas Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:12
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/26; E; E21; E21D; E21D23/00; E21D23/006; F04; F04B; F04B39/00; F04B39/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US986897A
Cited
US1220092A
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US1893623A
Cited
AT139271B
Cited
US2430519A
Cited
US2826306A
Cited
US3260368A
Cited
US3355023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |