US3737499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for modifying plastic surfaces
Assignee: Dow Chemical Co
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Filing: 1971-08-09
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Granted: 1973-06-05
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Expires: 1991-08-09
Abstract
Abstract A METHOD FOR MODIFYING A PLASTIC SURFACE OF A BODY BY EXPOSING THE SURFACE TO A GASEOUS SOLVENT ATMOSPHERE WHEREBY THE SOLVENT ISABSORBED INTO THE SURFACE, REGULATING THE AMOUNT OF ABSORPTION BY CONTROLLING THE TEMPERATURE DIFFERENTIAL BETWEEN THE BODY SURFACE AND THE SOLVENT ATMOSPHERE, INTRODUCING THE TREATED BODY SURFACE INTO A SECOND GASEOUS SOLVENT ATMOSPHERE WHICH IS MAINTAINED AT A TEMPERATURE ABOVE THE TEMPERATURE OF THE TREATED BODY SURFACE AND WITHDRAWING THE BODY FROM THE TREATING ZONES THEREBY REMOVING SUBSTANTIALLY ALL SURFACE BLEMISHES. A METHOD FOR COATING TO ESTABLISH THE PLASTIC SURFACE PRIOR TO MODIFICATION, BUT IN THE SAME APPARATUS, IS ALSO PROVIDED.
Inventors
- 👤 K Kamena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/04; B05D3/0466; B05D3/0473; B29; B29C; B29C71/00; B29C71/009; C; C08; C08J; C08J7/00; C08J7/02
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |