US3516448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bore hole type wells
Assignee: Rolls Royce PLC
•
Filing: 1965-08-20
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Granted: 1970-06-23
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Expires: 1985-08-20
Abstract
No abstract record available.
Inventors
- 👤 William Andrew Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:43
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/08; E03; E03B; E03B3/00; E03B3/06; E03B3/08; E03B3/16; E03B3/18; E03B3/20; E21B43/00; E21B43/02; E21B43/08; E21B43/086; E21B43/088; F; F16; F16L; F16L37/00; F16L37/08; F16L37/084; F16L37/088; F16L37/0885; F16L9/00; F16L9/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2742931A
Cited
US1268366A
Cited
US1657130A
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US1800642A
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US2791241A
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US3107698A
Cited
US3087560A
Cited
US3194275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |