US3177013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual string suspension assembly
Assignee: Individual
•
Filing: 1957-09-30
•
Granted: 1965-04-06
•
Expires: 1977-09-30
Abstract
No abstract record available.
Inventors
- 👤 Laurence L Rector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:03
CPC Classifications
F; F16; F16L; F16L39/00; E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/047
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
IN A TUBING SUPPORTING DEVICE; A TUBING HEAD HAVING A CENTRAL BORE THROUGH SAID HEAD AND AN ANNULAR UPWARDLY FACING SHOULDER ABOUT SAID BORE; A PAIR OF COMPLEMENTARY AND SEPARABLE MANDRELS HAVING COINCIDING EXTERIOR SURFACES SUSPENDED ON SAID SHOULDER, EACH MANDREL HAVING A TUBING STRING ATTACHED THEREBELOW AND COINCIDING VERTICAL SLOTS IN OPPOSITE EDGES OF SAID MANDRELS; AND RETRACTABLE PINS EXTENDING THROUGH THE WALLS OF SAID HEAD INTO SAID SLOTS TO PREVENT LATERAL OR ROTATIONAL MOVEMENT OF THE MANDRELS.
References Cited (Backward Citations)
USRE21627E
Cited
US2241333A
Cited
US2350867A
Cited
US2335355A
Cited
US2313169A
Cited
US2485497A
Cited
US2794505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |