US3585355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contamination resistant insulator
Assignee: Iowa State University Research Foundation Inc
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Filing: 1969-12-22
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Granted: 1971-06-15
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Expires: 1989-12-22
Abstract
Abstract A contamination resistant insulator including an insulative body having a heating resistor provided therein which emits heat to evaporate moisture deposits on the insulator. A humidistat means is mounted on the exterior surface of the insulative body and is adapted to energize and close a coil operated switch means upon sensing a predetermined humidity level. The switch means, upon being activated and closed, short circuits a switching resistor which is series connected to the heating resistor to increase the current flow in the heating resistor to increase the amount of heat generated thereby. A thermocouple is provided in the resistor circuit to deenergize and open the switch means upon the temperature of the insulator reaching a predetermined level. The opening of the switch means causes the current flow in the heating resistor to be lowered due to a circuit being reestablished through the switching resistor.
Inventors
- 👤 Essam Nasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:17
CPC Classifications
H; H01; H01B; H01B17/00; H01B17/54
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
181 words
An electrical insulator, comprising, a hollow body portion having interior and exterior surfaces, a heating resistor mounted in said hollow body portion electrically connected to a source of electrical energy adapted to emit heat when energized and adapted to transfer said heat to said body portion, a switching resistor series connected to said power source and said heating resistor, a normally open switch means electrically connected to said switching resistor for deenergizing said switching resistor when moved to its closed position, a normally open humidistat means electrically connected to said power source and said switch means, said humidistat means closing said switch means upon a predetermined humidity condition being senses thereby, said heating resistor having an increased current flow therethrough upon said humidistat means closing said switch means and deenergizing said switching resistor, said increased current flow in said heating resistor causing additional heat to be furnished to said body portion to evaporate moisture thereon, and a normally closed thermocouple means electrically connected to said switch means adapted to open said switch means upon said body portion reaching a predetermined temperature.
Claim 2
Dependent Claim
181 words
An electrical insulator, comprising, a hollow body portion having interior and exterior surfaces, a heating resistor mounted in said hollow body portion electrically connected to a source of electrical energy adapted to emit heat when energized and adapted to transfer said heat to said body portion, a switching resistor series connected to said power source and said heating resistor, a normally open switch means electrically connected to said switching resistor for deenergizing said switching resistor when moved to its closed position, a normally open humidistat means electrically connected to said power source and said switch means, said humidistat means closing said switch means upon a predetermined humidity condition being senses thereby, said heating resistor having an increased current flow therethrough upon said humidistat means closing said switch means and deenergizing said switching resistor, said increased current flow in said heating resistor causing additional heat to be furnished to said body portion to evaporate moisture thereon, and a normally closed thermocouple means electrically connected to said switch means adapted to open said switch means upon said body portion reaching a predetermined temperature.
Claim 3
Dependent Claim
19 words
The insulator of claim 1 wherein said humidistat means is mounted on the exterior surface of said body portion.
Claim 4
Dependent Claim
21 words
The insulator of claim 1 wherein said thermocouple means is mounted in said hollow body portion adjacent the interior wall thereof.
Claim 5
Dependent Claim
21 words
The insulator of claim 1 wherein said heating resistor is positioned closely adjacent the interior wall surface of said body portion.
Claim 6
Dependent Claim
77 words
The insulator of claim 1 wherein said switch means is an electrical coil operated double pole switch means including first and second pairs of contacts, one of the contacts of said first pair of contacts being electrically connected to one side of said switching resistor, the other contact of said first pair of contacts being electrically connected to the other side of said switching resistor, said switching resistor being short circuited upon said switch means being closed.
Claim 7
Dependent Claim
73 words
The insulator of claim 5 wherein one of the contacts of said second pair of contacts is electrically connected to one terminal side of said humidistat means, the other contact of said second pair of contacts being electrically connected to one terminal side of said thermocouple means, the other terminal side of said thermocouple means being electrically connected to a lead extending from ground to the other terminal side of said humidistat means.
Claim 8
Dependent Claim
192 words
The insulator of claim 1 wherein a first lead connects said power source to one end of said switching resistor, a second lead connecting one end of said switching resistor to one end of said heating resistor, a third lead connecting the other end of said heating resistor to ground, a fourth lead connecting said third lead to one contact of said humidistat means, said switch means including first and second pairs of contacts which are opened and closed by a coil means, a fifth lead connecting the other contact of said humidistat means with one contact of said second pair of contacts, a sixth lead connecting said first lead and one end of said coil means, a seventh lead connecting the other end of said coil means with said fifth lead, an eighth lead connecting the other contact of said second pair of contacts with said fourth lead, said thermocouple means being imposed in said eighth lead, a ninth lead connecting said first lead with one contact of said first pair of contacts, and a 10th lead connecting the other contact of said first pair of contacts with said second lead.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |