Patent US3323327A successfully refreshed from Google Patents.
US3323327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cushion drill collar
Assignee: Grant Oil Tool Co
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Filing: 1965-05-20
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Granted: 1967-06-06
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Expires: 1985-05-20
Abstract
No abstract record available.
Inventors
- 👤 Clarence H Leathers
- 👤 Jeddy D Nixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:29
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/07; E21B17/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
A DRILL COLLAR SHOCK ABSORBER ADAPTED TO BE INSERTED INTO A DRILLING STRING COMPRISING: A BODY DEFINING A LONGITUDINALLY EXTENDING OPENING THEREIN AND AN INWARDLY EXTENDING TRANSVERSE DOWNWARDLY FACING SHOULDER; A MANDREL MATABLE WITH SAID BODY IN SAID OPENING IN BEARING CONTACT WITH SAID SHOULDER; A CYLINDRICAL RESILIENT ISOLATING MEMBER, SAID MEMBER BEING INTERPOSED IN SAID MANDREL TO FORM THE ENTIRE CROSS-SECTION THEREOF ALONG A LONGITUDINALLY EXTENDING PORTION OF SAID MANDREL; AND MEANS NON-ROTATABLY CONNECTING SAID BODY AND SAID MANDREL.
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) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |