US3175240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pig injector
Assignee: Richfield Oil Corp
•
Filing: 1963-03-26
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Granted: 1965-03-30
•
Expires: 1983-03-26
Abstract
No abstract record available.
Inventors
- 👤 John M Hillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:44
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/26; F16L55/46; F16L2101/00; F16L2101/40; Y; Y10; Y10T; Y10T137/00; Y10T137/4891
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
AN APPARATUS FOR INJECTING A CLEANING PLUG INTO A FLOW LINE, COMPRISING: A CHANNEL COMMUNICATING WITH SAID FLOW LINE, A PLUG STORAGE CHAMBER COMMUNICATING WITH SAID CHANNEL, MEANS FOR RESTRICTING THE PASSAGE OF SAID PLUG FROM SAID STORAGE CHAMBER INTO SAID CHANNEL, SAID RESTRICTING MEANS BEING SEALINGLY ENGAGEABLE BY SAID PLUG,
Claim 2
Independent Claim
51 words
AN APPARATUS FOR INJECTING A CLEANING PLUG INTO A FLOW LINE, COMPRISING: A CHANNEL COMMUNICATING WITH SAID FLOW LINE, A PLUG STORAGE CHAMBER COMMUNICATING WITH SAID CHANNEL, MEANS FOR RESTRICTING THE PASSAGE OF SAID PLUG FROM SAID STORAGE CHAMBER INTO SAID CHANNEL, SAID RESTRICTING MEANS BEING SEALINGLY ENGAGEABLE BY SAID PLUG,
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |