US3928680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making pitch-impregnated fiber pipe
Assignee: Ashland LLC
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Filing: 1972-08-02
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Granted: 1975-12-23
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Expires: 1992-08-02
Abstract
Abstract Disclosed is a pitch-impregnated fiber pipe having a surface coating of pitch containing aluminum pigment. The method of manufacture comprises suspending unimpregnated, conventionally manufactured porous fiber pipe tubes in a suspension of aluminum powder in the liquid pitch and forcing the pitch into the pores and interstices of the fiber pipe tubes.
Inventors
- 👤 Charles R Gannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:56
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/14; D; D06; D06M; D06M11/00; D06M11/83; D06M15/00; D06M15/01; D06M15/17; D06N; D06N5/00; F16L58/00; F16L58/02; F16L58/04; F16L58/12; B; B31; B31B; B31B50/00; B31B50/74; B31B50/742; B31B50/745
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A PROCESS FOR MANUFACTURING A PITCH-IMPREGNATED FIBER PIPE HAVING A METALLIC-COLORED SURFACE COMPRISING; A. FORMING A TUBULARBODY OF INTERFELTED FIBROUS MATERIAL; B. IMMERSING SAID TUBULAR BODY OF (A) IN A LIQUID IMPREGNANT CONSISTING ESSENTIALLY OFMOLTEN UNOXIDIZED PETROLEUM PITCH AND SUSPENDED LEAFING ALUMINUM PIGMENT OF ASTM DESIGNATION 962-66; C. FORCING SAID LIQUID IMPREGNANT OF (B) INTO THE PORES SPACES AND INTERSTICS OF SAID TUBULAR BODY; AND D. REMOVING SAID TUBULAR BODY FROM SAID LIQUID IMPREGNANT AND QUENCHING SAID TUBULAR BODY;THEREBY FORMING A PITCH IMPREGNATED FIBER PIPE HAVING A METALLIC-COLORED SURFACE.
Claim 2
Dependent Claim
89 words
A PROCESS FOR MANUFACTURING A PITCH-IMPREGNATED FIBER PIPE HAVING A METALLIC-COLORED SURFACE COMPRISING; A. FORMING A TUBULARBODY OF INTERFELTED FIBROUS MATERIAL; B. IMMERSING SAID TUBULAR BODY OF (A) IN A LIQUID IMPREGNANT CONSISTING ESSENTIALLY OFMOLTEN UNOXIDIZED PETROLEUM PITCH AND SUSPENDED LEAFING ALUMINUM PIGMENT OF ASTM DESIGNATION 962-66; C. FORCING SAID LIQUID IMPREGNANT OF (B) INTO THE PORES SPACES AND INTERSTICS OF SAID TUBULAR BODY; AND D. REMOVING SAID TUBULAR BODY FROM SAID LIQUID IMPREGNANT AND QUENCHING SAID TUBULAR BODY;THEREBY FORMING A PITCH IMPREGNATED FIBER PIPE HAVING A METALLIC-COLORED SURFACE.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the concentration of aluminum pigment in said liquid impregnant is at least about 0.1 percent by weight.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the concentration of aluminum pigment in said liquid impregnant is at least about 0.3 percent by weight
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein said tubular body of (a) comprises interfelted cellulose fibers.
Claim 6
Dependent Claim
112 words
A process for manufacturing a pitch-impregnated fiber pipe having a metallic-colored surface comprising; a. forming a tubular body of interfelted fibrous material; b. immersing said tubular body of (a) in a liquid impregnant consisting essentially of molten unoxidized thermal petroleum pitch and suspended aluminum pigment of ASTM designation 962-66, said pigment being a non-leafing pigment which functions as a leafing pigment at the temperature of the molten pitch; c. forcing said liquid impregnant of (b) into the pore spaces and interstices of said tubular body and d. removing said tubular body from said liquid impregnant and quenching said tubular body; thereby forming a pitch impregnated fiber pipe having a metallic colored surface.
Claim 7
Dependent Claim
112 words
A process for manufacturing a pitch-impregnated fiber pipe having a metallic-colored surface comprising; a. forming a tubular body of interfelted fibrous material; b. immersing said tubular body of (a) in a liquid impregnant consisting essentially of molten unoxidized thermal petroleum pitch and suspended aluminum pigment of ASTM designation 962-66, said pigment being a non-leafing pigment which functions as a leafing pigment at the temperature of the molten pitch; c. forcing said liquid impregnant of (b) into the pore spaces and interstices of said tubular body and d. removing said tubular body from said liquid impregnant and quenching said tubular body; thereby forming a pitch impregnated fiber pipe having a metallic colored surface.
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |