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US3454308A
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US
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Assignee: Individual
•
Filing: 1968-01-19
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Granted: 1969-07-08
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Expires: 1988-01-19
Abstract
No abstract record available.
Inventors
- 👤 John R Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:48
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1078; E21B10/00; E21B10/46; E21B10/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1814271A
Cited
FR763529A
Cited
US2247173A
Cited
US2288124A
Cited
US3054647A
Cited
US3268274A
Cited
US3306378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |