Cement composition for lining pipe
Abstract
Abstract A CEMENT COMPOSITION FOR LINING STEEL PIPE BY CENTRIFUGAL CASTING OF A SLURRY OF THE CEMENT COMPOSITION COMPRISING SAND PARTICLES OF UNIFORM PARTICLE SIZE TO AVOID GRADATION OF THE SAND DURING THE CENTRIFUGAL CASTING OF THE LINING AND PORTLAND CEMENT IN A CONCENTRATION ADEQUATE TO JUST FILL THE VOIDS BETWEEN, AND WET THE SURFACE OF, THE SAND PARTICLES. A SMALL AMOUNT OF FLY ASH POZZOLAN IS INCLUDED IN THE COMPOSITION TO INCREASE THE FLUIDITY OF THE STIFF SLUDGE BY MIXING THE CEMENT COMPOSITION WITH WATER USED IN THE CASTING. AFTER CENTRIFUGAL CASTING OF THE LINING IN THE PIPE, THE PIPE IS STORED IN AN UNDISTURED CONDITION UNTIL INITIAL SET BEGINS AFTER WHICH THE LINING IS STEAM CURED AND WATER FLOODED.
Inventors
- 👤 Horace J Beach
- 👤 Howard J En Dean
- 👤 Frank E Frawley
- 👤 Dick Yates
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |