Coating of interior surfaces of pipe
Abstract
Abstract THE INTERIOR SURFACES OF PIPE ARE COATED BY PNEUMATICALLY PROPELLING THROUGH THE PIPE A COATING LIQUID CONFINED BETWEEN A COATING APPLICATOR AND A RETAINING PLUG USING A COATING APPLICATOR CONSTITUTED BY A CYLINDRICAL SLEEVE WHICH IS FORMED WITH EXTERNAL LONGITUDINAL GROOVES AND WHICH IS FLEXIBLE AND RESILIENT TO ACCOMMODATE IMPERFECTIONS IN THE PIPE AND WHICH IS BIASED AGAINST THE INTERIOR OF THE PIPE BY MEANS OF AN INFLATED BOOT. TO FACILITATE FLOWOUT AND TO AVOID RUNNING AND SAGGING, THE LIQUID COATING IS MADE THIXOTROPIC AND TO ELIMINATE THE NEED FOR REMOVING LARGE AMOUNTS OF SOLVENT, THE COATING LIQUID IS ESSENTIALLY SOLVENT FREE AND FORMULATED TO CURE UPON EXPOSURE TO THE GAS USED FOR PNEUMATIC PROPULSION AND IS PREFERABLY MADE TO BE CURED BY CONTACT WITH ATMOSPHERI MOISTURE.
Inventors
- 👤 Dewitt W Honeycutt Jr
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |