US3684554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the vapor phase surface sulfonation of plastic webs
Assignee: Dow Chemical Co
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Filing: 1969-06-02
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Granted: 1972-08-15
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Expires: 1989-06-02
Abstract
Abstract A PROCESS AND APPARATUS FOR THE RAPID VAPOR PHASE SULFONATION OF PLASTIC WEBS WHEREIN THE PLASTIC WEB IS TREATED WITH A BLAST OF GASEOUS SULFUR TRIOXIDE. OPTIONAL STEPS INCLUDE PREDRYING THE WEB AND SCRUBBING IT FREE OF EXCESS SULFUR TRIOXIDE WITH BLASTS OF DRY INERT GASES. THE INVENTION ALSO PROVIDES FOR FURTHER TREATMENT OF THE PLASTIC WEB WITH FLUID NEUTRALIZATION AGENTS OR METAL SALT SOLUTIONS.
Inventors
- 👤 Harold J Donald
- 👤 Carl E Dewald
- 👤 Robert J Caiola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:44
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/14; D; D06; D06M; D06M11/00; D06M11/51; D06M11/55
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |