Patent US3978341A successfully refreshed from Google Patents.
US3978341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short wavelength ultraviolet irradiation treatment of polymeric surfaces
Assignee: EIDP Inc
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Filing: 1974-04-10
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Granted: 1976-08-31
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Expires: 1994-04-10
Abstract
Abstract Surface properties of an article prepared from an organic polymer are improved by a method of irradiating the surface of the article in air with ultraviolet radiation in the range of about 830 to 1335 A. Apparatus for generating ultraviolet radiation includes a capacitor, an exciting electrode which coacts with at least one of two primary electrodes to produce an arc between the primary electrodes, switching and timing means for energizing the capacitor and means for limiting current between the exciting electrode and capacitor, and a source of ac voltage.
Inventors
- 👤 Paul Clason Hoell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:09
CPC Classifications
B; B29; B29C; B29C59/00; B29C59/16; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0827; B29K; B29K2033/00; B29K2033/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
Apparatus for applying ultraviolet radiation having a wavelength in the range of from about 830 A to about 1335 A to the surface of a shaped article prepared from an organic polymer comprising means for supporting said shaped article, first and second electrodes exposed in the atmosphere and spaced from about 1 mm to 9 mm apart and being spaced with respect to said means for supporting a shaped article such that a discharge arc between said electrodes will illuminate a shaped article supported by said means to support a shaped article; a 0.001 μf to 0.02 μf capacitor having its conductive surfaces connected with said first and second electrodes; means for charging said capacitor under a voltage of at least 1 kv per mm of spacing between said first and second electrodes.
Claim 2
Dependent Claim
133 words
Apparatus for applying ultraviolet radiation having a wavelength in the range of from about 830 A to about 1335 A to the surface of a shaped article prepared from an organic polymer comprising means for supporting said shaped article, first and second electrodes exposed in the atmosphere and spaced from about 1 mm to 9 mm apart and being spaced with respect to said means for supporting a shaped article such that a discharge arc between said electrodes will illuminate a shaped article supported by said means to support a shaped article; a 0.001 μf to 0.02 μf capacitor having its conductive surfaces connected with said first and second electrodes; means for charging said capacitor under a voltage of at least 1 kv per mm of spacing between said first and second electrodes.
Claim 3
Dependent Claim
44 words
The apparatus of claim 1 additionally comprising: an exciting electrode adjacent said first and second electrode for initiating said discharge arc, and a means for limiting current between said exciting electrode and said capacitor to prevent said capacitor from discharging through said exciting electrode.
Claim 4
Dependent Claim
60 words
The apparatus of claim 2 wherein the means for charging the capacitor is a step up high voltage transformer connected to a source of alternating current having inductively coupled primary and secondary windings, the secondary winding of which is connected to the condenser through resistors adapted to permit one discharge between the electrodes for every half cycle of alternating current.
Claim 5
Dependent Claim
21 words
Apparatus of claim 3 wherein switching and timing means are connected to said energy source to energize said transformer primary winding.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |