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US3403728A
Expired / Lapsed
US
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Apparatus for the suspension of well bore devices
Assignee: TRANSP ENGINEERING Inc
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Filing: 1965-12-17
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Granted: 1968-10-01
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Expires: 1985-12-17
Abstract
No abstract record available.
Inventors
- 👤 Vernon C H Richardson
- 👤 Billy G Frazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:03
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2945677A
Cited
US3001396A
Cited
US3158208A
Cited
US3158206A
Cited
US3208728A
Cited
US3285574A
Cited
US3276746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |