US3457991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well tools
Assignee: DONALD F TAYLOR JR
•
Filing: 1968-02-16
•
Granted: 1969-07-29
•
Expires: 1988-02-16
Abstract
No abstract record available.
Inventors
- 👤 Phillip S Sizer
- 👤 Donald F Taylor Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:54
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/02; E21B34/04; E21B34/045; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/064; E21B2200/00; E21B2200/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3007669A
Cited
US3065793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |