US3276246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stuffing box with leakage detector
Assignee: Sinclair Research Inc
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Filing: 1964-03-11
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Granted: 1966-10-04
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Expires: 1984-03-11
Abstract
No abstract record available.
Inventors
- 👤 Paul W Truman
- 👤 Bill R Burruss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:40
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/08; Y; Y10; Y10T; Y10T137/00; Y10T137/5762
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN AN OIL PUMPING APPARATUS WHICH INCLUDES A WELLHEAD, A MAIN STUFFING BOX ATTACHED TO THE TOP OF THE WELLHEAD, AND A POLISHED ROD MOVABLE THERETHROUGH, AN AUXILIARY STUFFING BOX ON SAID ROD ABOVE SAID MAIN STUFFING BOX INCLUDING A CENTRAL ENCLOSURE HAVING VERTICALLY ALIGNED UPPER AND LOWER APERTURES, UPPER AND LOWER SHAFT SEALS RETAINED IN SAID UPPER AND LOWER APERTURES, SAID UPPER SEAL SNUGLY SURROUNDING SAID ROD TO PREVENT PASSAGE OF OIL THEREALONG AND SAID LOWER SEAL LOOSELY SURROUNDING THE ROD TO PERMIT PASSAGE OF OIL THEREBETWEEN, A CONDUIT CON-
Claim 2
Dependent Claim
91 words
IN AN OIL PUMPING APPARATUS WHICH INCLUDES A WELLHEAD, A MAIN STUFFING BOX ATTACHED TO THE TOP OF THE WELLHEAD, AND A POLISHED ROD MOVABLE THERETHROUGH, AN AUXILIARY STUFFING BOX ON SAID ROD ABOVE SAID MAIN STUFFING BOX INCLUDING A CENTRAL ENCLOSURE HAVING VERTICALLY ALIGNED UPPER AND LOWER APERTURES, UPPER AND LOWER SHAFT SEALS RETAINED IN SAID UPPER AND LOWER APERTURES, SAID UPPER SEAL SNUGLY SURROUNDING SAID ROD TO PREVENT PASSAGE OF OIL THEREALONG AND SAID LOWER SEAL LOOSELY SURROUNDING THE ROD TO PERMIT PASSAGE OF OIL THEREBETWEEN, A CONDUIT CON-
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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |