US4475067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door lock illuminating device
Assignee: Individual
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Filing: 1982-05-28
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Granted: 1984-10-02
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Expires: 2002-05-28
Abstract
Abstract A device for illuminating the area surrounding a door lock or other relatively small area includes in a preferred embodiment a housing that is mounted on the door or other surface adjacent the area to be illuminated, the housing having a translucent portion through which an electrically energized lamp emits light. The lamp is energized by a battery connected thereto by an electronic circuit having a time-delay sub-circuit for de-energizing the lamp at the expiration of a prescribed time period. The time-delay sub-circuit further includes a means for varying the period of time that the lamp is energized.
Inventors
- 👤 Donald L. Rowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:23
CPC Classifications
G; G04; G04F; G04F1/00; G04F1/005; H; H05; H05B; H05B47/00; H05B47/10; E; E05; E05B; E05B17/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
An electronic timing circuit connecting a power source to a load, said circuit including: (a) first semi-conductor means connected in series with said load and said voltage source, said first semi-conductor means having base control means for switching said semi-conductor between two conditions when said base control means is grounded; said two conditions including: (i) an on condition in which said first semi-conductor is open; (ii) an on condition in which said first semi-conductor means is closed; (iii) said base control means including a normally open manual switch and a second transistor in shunt thereto for grounding said base; (b) an integrated circuit means for maintaining said first semi-conductor in the closed position for a prescribed period of time, said integrated circuit comprising a time delay circuit energized during said on condition and connected for controlling said second semi-conductor means; whereby said second semi-conductor and said time delay circuit act as a hold on contact for said prescribed time period.
Claim 2
Dependent Claim
160 words
An electronic timing circuit connecting a power source to a load, said circuit including: (a) first semi-conductor means connected in series with said load and said voltage source, said first semi-conductor means having base control means for switching said semi-conductor between two conditions when said base control means is grounded; said two conditions including: (i) an on condition in which said first semi-conductor is open; (ii) an on condition in which said first semi-conductor means is closed; (iii) said base control means including a normally open manual switch and a second transistor in shunt thereto for grounding said base; (b) an integrated circuit means for maintaining said first semi-conductor in the closed position for a prescribed period of time, said integrated circuit comprising a time delay circuit energized during said on condition and connected for controlling said second semi-conductor means; whereby said second semi-conductor and said time delay circuit act as a hold on contact for said prescribed time period.
Claim 3
Dependent Claim
177 words
An illumination device comprising a housing, an electrically operable lamp, a source of energy to said lamp, a switch means for activating said energy source, and an electronic timing circuit including: (a) first semi-conductor means connected in series with said lamp and said voltage source, said first semi-conductor means having base control means for switching said semi-conductor between two conditions when said base control means is grounded; said two conditions including: (i) an off condition in which said first semi-conductor is open; (ii) an on condition in which said first semi-conductor means is closed; (iii) said base control means including a normally open manual switch and a second transistor in shunt thereto for grounding said base; (b) an integrated circuit means for maintaining said first semi-conductor in the closed position for a prescribed period of time, said integrated circuit comprising a time delay circuit energized during said on condition and connected for controlling said second semi-conductor means; whereby said second semi-conductor and said time delay circuit act as a hold on contact for said prescribed time period.
Claim 4
Dependent Claim
177 words
An illumination device comprising a housing, an electrically operable lamp, a source of energy to said lamp, a switch means for activating said energy source, and an electronic timing circuit including: (a) first semi-conductor means connected in series with said lamp and said voltage source, said first semi-conductor means having base control means for switching said semi-conductor between two conditions when said base control means is grounded; said two conditions including: (i) an off condition in which said first semi-conductor is open; (ii) an on condition in which said first semi-conductor means is closed; (iii) said base control means including a normally open manual switch and a second transistor in shunt thereto for grounding said base; (b) an integrated circuit means for maintaining said first semi-conductor in the closed position for a prescribed period of time, said integrated circuit comprising a time delay circuit energized during said on condition and connected for controlling said second semi-conductor means; whereby said second semi-conductor and said time delay circuit act as a hold on contact for said prescribed time period.
Claim 5
Dependent Claim
18 words
An illumination device according to claim 2 wherein said integrated circuit is of a type described thyristor/transistor array.
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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |