Patent US4683741A successfully refreshed from Google Patents.
US4683741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light signal for door knob and lock assembly
Assignee: Individual
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Filing: 1986-07-14
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Granted: 1987-08-04
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Expires: 2006-07-14
Abstract
Abstract A door knob and lock assembly having a pair of knobs, a latching bolt operable by the rotation of the knobs, and a turn button to selectively arrest the movement of the bolt to place the assembly in locked condition. A battery operated electrical circuit including a switch operable by the turn button, and a light emitting diode mounted within the door knobs so as to be operable on locking the door to provide a flashing light visible from the outside of the door.
Inventors
- 👤 Roy A. Fields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:20
CPC Classifications
E; E05; E05B; E05B17/00; E05B17/10; E05B41/00; Y; Y10; Y10T; Y10T70/00; Y10T70/80; Y10T70/8027; Y10T70/827
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
139 words
In a door knob and lock assembly for a bathroom door having one of a pair of knobs on the exterior and one on the interior of said bathroom door and a latching bolt operable by the rotation of the knobs, said one of the knobs on the interior of said bathroom door being provided with a turn button operable to selectively arrest the movement of the bolt to place the assembly in locked condition, the improvement comprising a battery operated electrical circuit for indicating only said locked condition of said assembly, said circuit including switch means operable by the turn button to activate a light emitting diode, said light emitting diode being mounted in conjunction with said one door knob on the exterior of said bathroom door so as to be visible from the exterior of the door.
Claim 2
Dependent Claim
139 words
In a door knob and lock assembly for a bathroom door having one of a pair of knobs on the exterior and one on the interior of said bathroom door and a latching bolt operable by the rotation of the knobs, said one of the knobs on the interior of said bathroom door being provided with a turn button operable to selectively arrest the movement of the bolt to place the assembly in locked condition, the improvement comprising a battery operated electrical circuit for indicating only said locked condition of said assembly, said circuit including switch means operable by the turn button to activate a light emitting diode, said light emitting diode being mounted in conjunction with said one door knob on the exterior of said bathroom door so as to be visible from the exterior of the door.
Claim 3
Dependent Claim
26 words
The door knob and lock assembly according to claim 1, wherein said electrical circuit includes a flasher unit for causing said light emitting diode to blink.
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) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |