Patent US3003194A successfully refreshed from Google Patents.
US3003194A
Expired / Lapsed
US
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Method of producing bituminous glass-fiber pipe
Assignee: Perma Tubes Ltd USA
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Filing: 1959-06-16
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Granted: 1961-10-10
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Expires: 1979-06-16
Abstract
No abstract record available.
Inventors
- 👤 Jules W Hunkeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:54
CPC Classifications
C; C08; C08L; C08L95/00; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/09; B29C48/10; B29C48/15; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29K2105/16; B29L; B29L2023/00; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S264/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN THE PRODUCTION OF BITUMINOUS GLASS-FIBER PIPE, THE METHOD COMPRISING THE STEPS OF (A) MECHANICALLY INTERMIXING MOLTEN ASPHALT AT A TEMPERATURE OF 450-500*F., STAPLE GLASS FIBERS OF A LENGTH RANGING FROM 1" TO 1 1/2", AND A MINERAL FILLER COMPRISING ASBESTOS SHORTS AND LIMESTONE, WITH THE GLASS FIBERS CONSTITUTING 10-20% OF THE MIXTURE AND THE MINERAL FILLER 10-20% OF THE TOTAL MIXTURE, AND (B) CONTINUOUSLY EXTRUDING SAID MIXTURE IN A WORKABLE CONDITION UNDER PRESSURE THROUGH A DIE AND DIRECTLY INTO A VACUUM CHAMBER ON THE OPPOSITE SIDE OF SAID DIE TO FORM A PIPE.
Claim 2
Dependent Claim
94 words
IN THE PRODUCTION OF BITUMINOUS GLASS-FIBER PIPE, THE METHOD COMPRISING THE STEPS OF (A) MECHANICALLY INTERMIXING MOLTEN ASPHALT AT A TEMPERATURE OF 450-500*F., STAPLE GLASS FIBERS OF A LENGTH RANGING FROM 1" TO 1 1/2", AND A MINERAL FILLER COMPRISING ASBESTOS SHORTS AND LIMESTONE, WITH THE GLASS FIBERS CONSTITUTING 10-20% OF THE MIXTURE AND THE MINERAL FILLER 10-20% OF THE TOTAL MIXTURE, AND (B) CONTINUOUSLY EXTRUDING SAID MIXTURE IN A WORKABLE CONDITION UNDER PRESSURE THROUGH A DIE AND DIRECTLY INTO A VACUUM CHAMBER ON THE OPPOSITE SIDE OF SAID DIE TO FORM A 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) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |