Patent US1889978A successfully refreshed from Google Patents.
US3247374A
Expired / Lapsed
US
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Air treating device having means for producing negative ions
Assignee: Individual
•
Filing: 1962-08-29
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Granted: 1966-04-19
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Expires: 1982-08-29
Abstract
No abstract record available.
Inventors
- 👤 Carlton H Wintermute
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:43
CPC Classifications
H; H01; H01T; H01T23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
AIR-TREATING APPARATUS FOR PRODUCING NEGATIVE IONS IN THE ATMOSPHERE COMPRISING, IN COMBINATION, A SOURCE OF ULTRAVIOLET RADIATION, AN ELECTRON EMITTER HAVING A SURFACE COATED WITH A METALLIC MATERIAL OF LOW PHOTOELECTRIC WORK FUNCTION TAKEN FROM THE GROUP CONSISTING OF GOLD, SILVER, AND THE COMBINATION THEREOF, SAID EMITTER BEING NORMALLY MAINTAINED AT AMBIENT TEMPERATURE AND GENERATING FREE ELECTRONS INTO THE ATMOSPHERE BY PHOTOELECTRIC EMISSION WHEN SUBJECTED TO ULTRAVIOLET RADIATION FROM SAID SOURCE, MEANS FOR CIRCULATING AIR PAST SAID EMITTER, AND MEANS FOR PERIODICALLY HEATING SAID SURFACE OF SAID EMITTER TO AN ELEVATED TEMPERATURE SUBSTANTIALLY IN THE RANGE 600-1,000*F. FOR ABOUT 3-5 MINUTES'' DURATION IN ORDER TO CAUSE REACTIVATION OF THE PHOTOLECTRIC EMISSION PROPERTIES OF SAID EMITTER.
Claim 2
Dependent Claim
115 words
AIR-TREATING APPARATUS FOR PRODUCING NEGATIVE IONS IN THE ATMOSPHERE COMPRISING, IN COMBINATION, A SOURCE OF ULTRAVIOLET RADIATION, AN ELECTRON EMITTER HAVING A SURFACE COATED WITH A METALLIC MATERIAL OF LOW PHOTOELECTRIC WORK FUNCTION TAKEN FROM THE GROUP CONSISTING OF GOLD, SILVER, AND THE COMBINATION THEREOF, SAID EMITTER BEING NORMALLY MAINTAINED AT AMBIENT TEMPERATURE AND GENERATING FREE ELECTRONS INTO THE ATMOSPHERE BY PHOTOELECTRIC EMISSION WHEN SUBJECTED TO ULTRAVIOLET RADIATION FROM SAID SOURCE, MEANS FOR CIRCULATING AIR PAST SAID EMITTER, AND MEANS FOR PERIODICALLY HEATING SAID SURFACE OF SAID EMITTER TO AN ELEVATED TEMPERATURE SUBSTANTIALLY IN THE RANGE 600-1,000*F. FOR ABOUT 3-5 MINUTES'' DURATION IN ORDER TO CAUSE REACTIVATION OF THE PHOTOLECTRIC EMISSION PROPERTIES OF SAID EMITTER.
References Cited (Backward Citations)
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Cited
US2151785A
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US2715195A
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US2932759A
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US3072978A
Cited
US3128378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |