Patent US3347692A successfully refreshed from Google Patents.
US3347692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating articles with graft copolymers of polypropylene and acrylic acid
Assignee: Dow Chemical Co
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Filing: 1964-08-26
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Granted: 1967-10-17
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Expires: 1984-08-26
Abstract
No abstract record available.
Inventors
- 👤 Lewis J Young
- 👤 Joseph E Burkholder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:30
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/18; B05D1/22; B05D1/24; C; C03; C03C; C03C17/00; C03C17/28; C03C17/32; C03C17/328; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31645
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
THE METHOD OF FORMING ADHERENT, CORROSION RESISTANT COATINGS TO SOLID PARTICLES WHICH COMPRISES THE SEQUENTIAL STEPS OF: (1) FORMING A FLUIDIZED BED OF A FINELY DIVIDED MATERIAL CONSISTING ESSENTIALLY OF A THERMOPLALSTIC GRAFT COPOLYMER OF (A) 75 TO 98 PERCENT BY WEIGHT OF POLYPROPYLENE AND (B) 25 TO 2 PERCENT BY WEIGHT OF ACRYLIC ACID; (2) PREHEATING SAID SOLIC ARTICLE TO A TEMPERATURE BETWEEN ABOUT 250*C. TO 400*C.; (3) PLACING SAID SOLID ARTICLE IN SAID FLUIDIZED BED FOR A PERIOD OF UP TO ABOUT 7 SECONDS; (4) REMOVING SAID SOLID ARTICLE FROM SAID FLUIDIZED BED; AND (5) POST-HEATING SAID SOLID ARTICLE AT A TEMPERATURE BETWEEN ABOUT 150*C. AND 180*C. FOR A PERIOD OF BETWEEN ABOUT 5 AND 10 MINUTES TO PROVIDE UNIFORMLY SMOOTH, ADHERENT COATINGS OF SAID THERMOPLASTIC GRAFT COPOLYMER ON SAID SOLID ARTICLE.
Claim 2
Independent Claim
134 words
THE METHOD OF FORMING ADHERENT, CORROSION RESISTANT COATINGS TO SOLID PARTICLES WHICH COMPRISES THE SEQUENTIAL STEPS OF: (1) FORMING A FLUIDIZED BED OF A FINELY DIVIDED MATERIAL CONSISTING ESSENTIALLY OF A THERMOPLALSTIC GRAFT COPOLYMER OF (A) 75 TO 98 PERCENT BY WEIGHT OF POLYPROPYLENE AND (B) 25 TO 2 PERCENT BY WEIGHT OF ACRYLIC ACID; (2) PREHEATING SAID SOLIC ARTICLE TO A TEMPERATURE BETWEEN ABOUT 250*C. TO 400*C.; (3) PLACING SAID SOLID ARTICLE IN SAID FLUIDIZED BED FOR A PERIOD OF UP TO ABOUT 7 SECONDS; (4) REMOVING SAID SOLID ARTICLE FROM SAID FLUIDIZED BED; AND (5) POST-HEATING SAID SOLID ARTICLE AT A TEMPERATURE BETWEEN ABOUT 150*C. AND 180*C. FOR A PERIOD OF BETWEEN ABOUT 5 AND 10 MINUTES TO PROVIDE UNIFORMLY SMOOTH, ADHERENT COATINGS OF SAID THERMOPLASTIC GRAFT COPOLYMER ON SAID SOLID ARTICLE.
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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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |