US3814616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating the inner surface of metal pipes
Assignee: Kansai Paint Co Ltd
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Filing: 1971-05-04
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Granted: 1974-06-04
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Expires: 1991-05-04
Abstract
Abstract A METHOD FOR COATING THE INNER SURFACE OF A METAL PIPE HAVING AN INNER DIAMETER OF 2 TO 15CM. IS CHARACTERIZED BY HEATING SAID METAL PIPE ELECTRICALLY GROUNDED AT A TEMPERATURE OF FROM A SOFTENING POINT OF A COATING COMPOSITION TO BELOW A MELTING POINT THEREOF, FEEDING NEGATIVE CHARGED DRY PARTICLE OF A COATING COMPOSITION INTO THE INTERIOR OF SAI METAL PIPE FROM ONE END OF THE PIPE AND SUCKING AIR AT THE SAME TIME FROM THE OTHER END OF THE METAL PIPE SO AS TO FORM AN AIR STREAM CARRYING THE PARTICLES AND TO ALLOW THE PATICLES TO DEPOSIT ELECTROSTATICALLY ON THE INNER SURFACE OF THE PIPE.
Inventors
- 👤 T Kondo
- 👤 K Inamura
- 👤 M Kamimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:57
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/08; B05B5/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |