US3770199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the controlled emission of vapours
Assignee: US Philips Corp
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Filing: 1971-09-13
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Granted: 1973-11-06
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Expires: 1991-09-13
Abstract
Abstract A device for the controlled emission of vapors comprising an inner tubular or box-shaped member which contains a volatile active substance and is permeable to vapor. The inner member is telescopingly arranged in a second tubular or box-shaped outer member so that the inner member may be entirely or partially sealed by the outer member. The inner member contains a porous container which may be filled with the active substance and the maximum pore width of which is 30 microns. The container is preferably made of polyethylene. The inner member may either be apertured or be made of a porous material.
Inventors
- 👤 S Hoek
- 👤 W Buhren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:46
CPC Classifications
A; A01; A01M; A01M1/00; A01M1/20; A01M1/2022; A01M1/2027; A01M1/2044
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
138 words
A device for the controlled emission of vapors comprising an outer tubular member impermeable to vapor and closed at one end thereof and opened at its other end, a hermetically sealed inner tubular member telescopingly carried within said outer member, said inner member being permeable to vapor, a closed porous container carried within said inner member for carrying a liquid active substance, the maximum pore diameter of any of the pores of said closed container being 30 microns and quide means carried by said outer member for guiding said inner member therein, said inner member being porous and made of low-pressure polyethylene having a high specific weight, the outer surface of said container engaging the inner surface of the inner member, the pore width of the inner member being greater than the maximum pore width of the container.
Claim 2
Independent Claim
138 words
A device for the controlled emission of vapors comprising an outer tubular member impermeable to vapor and closed at one end thereof and opened at its other end, a hermetically sealed inner tubular member telescopingly carried within said outer member, said inner member being permeable to vapor, a closed porous container carried within said inner member for carrying a liquid active substance, the maximum pore diameter of any of the pores of said closed container being 30 microns and quide means carried by said outer member for guiding said inner member therein, said inner member being porous and made of low-pressure polyethylene having a high specific weight, the outer surface of said container engaging the inner surface of the inner member, the pore width of the inner member being greater than the maximum pore width of the container.
Claim 3
Dependent Claim
17 words
The device as claimed in claim 1, wherein said inner and outer members are made of polyethylene.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |