Patent US3839620A successfully refreshed from Google Patents.
US3839620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation free mirror
Assignee: Individual
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Filing: 1972-10-13
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Granted: 1974-10-01
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Expires: 1992-10-13
Abstract
Abstract An anti-condensation device for mirrors comprising a printed circuit board heating element and a means for mounting said printed circuit board on the rear surface of the mirror is described. The mirror assembly herein provided with said heating element maintains the mirror viewing surface free from moisture condensation. In another embodiment of the invention the mirror assembly containing the printed circuit board additionally includes the incorporation of an electronic control package, which provides an automatic and constant operating temperature, fast warm-up, long operating life and is simple, economical and carefree to operate. This unique circuit avoids the complex and unreliable switching schemes for turning the heating element on and off.
Inventors
- 👤 R Seibel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:38
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/84; H05B3/845; A; A47; A47G; A47G1/00; A47G1/02; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1919; G05D23/275
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
A condensation free mirror assembly comprising a transparent plate, a light reflective coating on one side of said plate, an electrically energizeable heating element consisting of a printed circuit board containing a continuous path of etched copper, said path being of a uniform thickness, a means for mounting said heating element on said transparent plate, a means of supplying electric power to said heating element whereby electrical power can be transmitted from an electrical power source to said heating element thereby energizing said heating element whereby said plate is heated.
Claim 2
Dependent Claim
90 words
A condensation free mirror assembly comprising a transparent plate, a light reflective coating on one side of said plate, an electrically energizeable heating element consisting of a printed circuit board containing a continuous path of etched copper, said path being of a uniform thickness, a means for mounting said heating element on said transparent plate, a means of supplying electric power to said heating element whereby electrical power can be transmitted from an electrical power source to said heating element thereby energizing said heating element whereby said plate is heated.
Claim 3
Dependent Claim
111 words
A condensation free mirror assembly comprising a transparent plate, a light reflective coating on one side of said plate, an electrically energizeable heating element consisting of a printed circuit board containing a continuous path of etched copper, said path being of uniform thickness, said printed circuit board further having an aperture through which a thermal fuse suitably contacts said plate thereby providing a means for maintaining the temperature of said plate below a predetermined level, a means for mounting said heating element on said transparent plate, a means of supplying electrical power from an electrical power source to the heating element whereby the heating element is energized thereby heating said plate.
Claim 4
Dependent Claim
111 words
A condensation free mirror assembly comprising a transparent plate, a light reflective coating on one side of said plate, an electrically energizeable heating element consisting of a printed circuit board containing a continuous path of etched copper, said path being of uniform thickness, said printed circuit board further having an aperture through which a thermal fuse suitably contacts said plate thereby providing a means for maintaining the temperature of said plate below a predetermined level, a means for mounting said heating element on said transparent plate, a means of supplying electrical power from an electrical power source to the heating element whereby the heating element is energized thereby heating said plate.
Claim 5
Dependent Claim
45 words
The condensation free mirror assembly of claim 2 wherein said means for mounting said heating element to said plate comprises coating the surfaces of said heating element and plate with an epoxy comprising epichlorhydrin bisphenol and thereafter contacting said coated surfaces, one to the other.
Claim 6
Dependent Claim
23 words
The condensation free mirror assembly of claim 2 wherein the temperature of said plate is maintained in the range of from about 85*-136*F.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |