Method for cleaning pipelines
Abstract
Abstract PROCEDURE FOR CLEANING PIPLINES WHICH INCLUDES FORCING A PLURALITY OF PIPELINE CLEANING "PIG" BALLS THROUGH THE PIPELINE. PIPELINE CLEANING KIT COMPRISING A FIRST LEAD "PIG" BALL AND A SECOND FOLLOWER "PIG" BALL. THE "PIG" BALLS HAVE A GENERALLY SPHERICAL MAIN BODY FORMED OF A RESILIENTLY DEFORMABLE MATERIAL WHICH IS PROVIDED WITH A PLURALITY OF DISCRETE, DISCONTINUOUS AND LATERALLY SPACED APART PROTUBERANCES UPSTANDING FROM THE SURFACE THEREOF. IN EACH CASE THE PRETUBERANCES HAVE A HARDNESS GREATER THAN THAT OF THE MAIN BODY. IN ADDITION, THE SECOND OR FOLLOWER "PIG" BALL HAS A MAIN BODY FORMED OF A RESILIENTLY DEFORMABLE MATERIAL HAVING A HARDNESS GREATER THAN THE HARDNESS OF THE MAIN BODY OF THE FIRST OR LEADING "PIG" BALL. THE "PIG" BALLS PREFERABLY ARE FORMED OF NATURAL OR SYNTHETIC RUBBER, WITH THE PROTUBERANCES HAVING A TIP FORMED OF A HARD METALLIC SUBSTANCE SUCH AS TUNGSTEN CARBIDE.
Inventors
- 👤 Ronald W Schultz
Bibliographic Details
Claims Analysis
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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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |