Patent US3687832A successfully refreshed from Google Patents.
US3687832A
Expired / Lapsed
US
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Production of improved polymeric materials using electrical gas discharges
Assignee: Surface Activation Corp
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Filing: 1970-11-23
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Granted: 1972-08-29
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Expires: 1990-11-23
Abstract
Abstract A METHOD OF INCREASING THE SOLVENT RESISTANCE OF THE SURFACE OF A POLYMERIC MATERIAL BY EXPOSING THE SAME TO THE ACTIVE SPECIES FORMED BY AN ELECTRIC DISCHARGE IN A GASEOUS MIXTURE AT A PRESSURE OF AT LEAST 100 MM. OF MERCURY WITH THE GASEOUS MIXTURE MADE UP MAINLY OF AN INERT GAS SUCH AS ARGON AND A MINOR PROPORTION OF ANOTHER GAS SUCH AS OXYGEN WHICH MODIFIES THE ACTIVE SPECIES IN THE DISCHARGE PLASMA.
Inventors
- 👤 Peter John Fydelor
- 👤 Keith Victor Lovell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:14
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/32
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |