US3348995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating metal surfaces with polyethylene utilizing a polyethylene primer and articles produced thereby
Assignee: American Cast Iron Pipe Co
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Filing: 1964-03-09
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Granted: 1967-10-24
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Expires: 1984-03-09
Abstract
No abstract record available.
Inventors
- 👤 James R Baker
- 👤 Edwin H Phelps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:26
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B05; B05D; B05D7/00; B05D7/14; B05D7/146; B05D7/16; B05D7/50; B05D7/52; B05D7/54; B05D7/546; B05D1/00; B05D1/002; B05D2451/00; B05D2507/00; B05D2507/01; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24992; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A METHOD OF COATING METAL SURFACES WITH POLYETHYLENE COMPRISING THE STEPS OF APPLYING TO A METAL SUBSTRATE A HIGH DENSITY POLYETHYLENE MATERIAL HAVING A SPECIFIC GRAVITY IN THE RANGE OF 0.941 TO 0.965 TO FORM A FIRST LAYER OF PREDETERMINED THICKNESS WHILE MAINTAINING SAID SUBSTRATE AT A TEMPERATURE OF AT LEAST 500*F. SO AS TO MELT THE POLYETHYLENE MATERIAL, AND THEN APPLYING TO SAID FIRST LAYER A LOWER DENSITY POLYETHYLENE MATERIAL HAVING A SPECIFIC GRAVITY IN THE RANGE OF 0.910 TO 0.940 TO FORM A SECOND LAYER GREATER IN THICKNESS THAN SAID FIRST LAYER WHILE MAINTAINING SAID SUBSTRATE AT A TEMPERATURE OF AT LEAST 350*F. AND SUFFICIENT TO EFFECT COMPLETE MELTING OF BOTH OF SAID LAYERS AT TH JUNCTION THEREBETWEEN.
Claim 2
Independent Claim
120 words
A METHOD OF COATING METAL SURFACES WITH POLYETHYLENE COMPRISING THE STEPS OF APPLYING TO A METAL SUBSTRATE A HIGH DENSITY POLYETHYLENE MATERIAL HAVING A SPECIFIC GRAVITY IN THE RANGE OF 0.941 TO 0.965 TO FORM A FIRST LAYER OF PREDETERMINED THICKNESS WHILE MAINTAINING SAID SUBSTRATE AT A TEMPERATURE OF AT LEAST 500*F. SO AS TO MELT THE POLYETHYLENE MATERIAL, AND THEN APPLYING TO SAID FIRST LAYER A LOWER DENSITY POLYETHYLENE MATERIAL HAVING A SPECIFIC GRAVITY IN THE RANGE OF 0.910 TO 0.940 TO FORM A SECOND LAYER GREATER IN THICKNESS THAN SAID FIRST LAYER WHILE MAINTAINING SAID SUBSTRATE AT A TEMPERATURE OF AT LEAST 350*F. AND SUFFICIENT TO EFFECT COMPLETE MELTING OF BOTH OF SAID LAYERS AT TH JUNCTION THEREBETWEEN.
References Cited (Backward Citations)
CA561041A
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US2697058A
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GB823175A
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US2907671A
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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) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |