US4206366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical smoke detector
Assignee: Sentrol Inc A Corp Of Oregon
•
Filing: 1978-10-06
•
Granted: 1980-06-03
•
Expires: 1998-10-06
Abstract
Abstract An optical smoke detector including a plurality of walls extending from a dark chamber in which an optical smoke sensor is located. The walls form passages in the detector which extend from smoke entrances on the outer perimeter to smoke ports that feed into the dark chamber. In construction, the smoke entrances extend substantially continuously around the perimeter of the smoke detector to allow the free entry of smoke into the dark chamber. Each wall is arranged to overlap the next so as to obstruct the direct rays of light from entering the dark chamber and a screen is disposed around the perimeter of the detector to prevent the entrance of insects into the dark chamber.
Inventors
- 👤 Angelo A. Marsocci
- 👤 Robert B. Powers
- 👤 Hugh D. Dyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:16
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/103; G08B17/107; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
An optical smoke detector comprising: a housing enclosing a dark chamber; means for sensing smoke in the dark chamber; said housing including wall means forming a plurality of spiralled passages extending from an outer periphery to smoke ports opening into said dark chamber, the wall means forming smoke entrances extending substantially completely around the entire periphery, the wall means on one side of each passage overlapping the wall means on the other side of the passage so as to obstruct light from entering the smoke port at the end of the passage.
Claim 2
Dependent Claim
92 words
An optical smoke detector comprising: a housing enclosing a dark chamber; means for sensing smoke in the dark chamber; said housing including wall means forming a plurality of spiralled passages extending from an outer periphery to smoke ports opening into said dark chamber, the wall means forming smoke entrances extending substantially completely around the entire periphery, the wall means on one side of each passage overlapping the wall means on the other side of the passage so as to obstruct light from entering the smoke port at the end of the passage.
Claim 3
Dependent Claim
15 words
The detector according to claim 1 including a wire mesh means disposed around said periphery.
Claim 4
Dependent Claim
24 words
The detector according to claim 1 wherein the spiralled passages formed by the wall means converge from the smoke entrances to the smoke ports.
Claim 5
Dependent Claim
41 words
The detector according to claim 1 wherein a base is disposed on one side of said wall means and a cover is disposed on the other side, said base and said cover, together with said wall means forming said dark chamber.
Claim 6
Dependent Claim
39 words
The detector according to claim 1 wherein said wall means are formed in two portions, one portion of which are walls which extend around said dark chamber and the second portion of which are walls which define said passages.
Claim 7
Dependent Claim
33 words
The detector according to claim 5 wherein baffles are disposed in said dark chamber, in front of said smoke ports so as to further obstruct light from entering near the smoke sensing means.
Claim 8
Dependent Claim
18 words
The detector according to claim 2 including retaining means in the base to support said wire mesh means.
Claim 9
Dependent Claim
25 words
The detector according to claim 7 wherein said retaining means is a channel disposed in the base and extending in front of said smoke entrances.
Claim 10
Dependent Claim
20 words
The detector according to claim 1 wherein the smoke sensing means is disposed in the center of said dark chamber.
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) | 1983-06-03 | 1983-12-03 | 1984-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-03 | 1987-12-03 | 1988-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-03 | 1991-12-03 | 1992-06-03 | $7700.00 | Window Closed / Lapsed |