US3417827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Gulf Research and Development Co
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Filing: 1967-01-09
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Granted: 1968-12-24
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Expires: 1987-01-09
Abstract
No abstract record available.
Inventors
- 👤 Francis M Smith
- 👤 Paul L Terwilliger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:15
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/087; E21B17/00; E21B17/20; E21B17/206; E21B19/00; E21B19/22; E21B33/00; E21B33/10; E21B33/12; E21B33/124; E21B33/1243; E21B43/00; E21B43/11; E21B43/116; E21B47/00; E21B47/06
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) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |