Patent US2887728A successfully refreshed from Google Patents.
US2887728A
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Method of centrifugally casting a pipe using thermoplastic and thermosetting resins
Assignee: Reflin Co
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Filing: 1954-05-14
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Granted: 1959-05-26
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Expires: 1974-05-14
Abstract
No abstract record available.
Inventors
- 👤 Ernest M Usab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:02
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/04; Y; Y10; Y10S; Y10S264/00; Y10S264/53; Y10S524/00; Y10S524/92
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A METHOD FOR PRODUCING CENTRIFUGALLY CAST PLASTIC PIPE INCLUDING: DISPERSING A BODY OF PARTICLES OF THERMOPLASTIC RESIN, CARRYING A COATING OF A DISSIPATING CARRIER, IN A LIQUID THEREMOSETTING RESIN OF DIFFERENT SPECIFIC GRAVITY OF AT LEAST 0.03 GRAVITY DIFFERENTIAL GREATER THAN THAT OF THE THERMOPLASTIC RESIN; INTRODUCING INTO A CYLINDRICAL MOLD A QUANTITY OF SUCH LIQUID DISPERSION OF THERMOSETTING AND THERMOPLASTIC RESINS OF DIFFERENT SPECIFIC GRAVITIES; AND CENTRIFUGING SAID MIXTURE IN SAID CYLINDRICAL MOLD TO YIELD A PARTIALLLY SEPARATED THERMOPLASTIC LAYER CONSTITUTING ONE WALL OF THE CAST PIPE.
Claim 2
Independent Claim
88 words
A METHOD FOR PRODUCING CENTRIFUGALLY CAST PLASTIC PIPE INCLUDING: DISPERSING A BODY OF PARTICLES OF THERMOPLASTIC RESIN, CARRYING A COATING OF A DISSIPATING CARRIER, IN A LIQUID THEREMOSETTING RESIN OF DIFFERENT SPECIFIC GRAVITY OF AT LEAST 0.03 GRAVITY DIFFERENTIAL GREATER THAN THAT OF THE THERMOPLASTIC RESIN; INTRODUCING INTO A CYLINDRICAL MOLD A QUANTITY OF SUCH LIQUID DISPERSION OF THERMOSETTING AND THERMOPLASTIC RESINS OF DIFFERENT SPECIFIC GRAVITIES; AND CENTRIFUGING SAID MIXTURE IN SAID CYLINDRICAL MOLD TO YIELD A PARTIALLLY SEPARATED THERMOPLASTIC LAYER CONSTITUTING ONE WALL OF THE CAST PIPE.
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) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |