US3717303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of vacuum-packing insecticidal materials
Assignee: L'Oréal SA
•
Filing: 1970-09-11
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Granted: 1973-02-20
•
Expires: 1990-09-11
Abstract
Abstract Method of packaging a sheet impregnated with an insecticidal product which evaporates slowly and which is contained in a perforated box which serves as a diffuser, by inserting the perforated box containing the impregnated sheet into a bag consisting of a flexible gas impervious material, placing the bag inside a chamber at a partial vacuum, introducing inert gas into said chamber to increase the pressure therewithin to a value still less than atmospheric pressure, sealing the bag, and increasing the pressure in said chamber to atmospheric pressure.
Inventors
- 👤 J Daeninckx
- 👤 R Bouvet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:48
CPC Classifications
B; B65; B65D; B65D75/00; B65D75/26; B65B; B65B31/00; B65B31/02; B65B31/024; B65D75/52; B65D75/54; B65D81/00; B65D81/18; B65D81/20; B65D81/2069; B65D81/2084; Y; Y02; Y02W; Y02W90/00; Y02W90/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
A gas-impervious flexible bag housing a perforated box having a sheet impregnated with an insecticidal material therein, said bag having an inert gas therein of between 30 and 60 cm of mercury, said bag being heat-sealed to contain said inert gas therein, the difference in the pressure within the bag and the ambient pressures surrounding the same causing said bag to engage with the walls of the perforated box and to remain in contact with the walls of said perforated box until such time as the pressure within said bag is at least equal to the surrounding atmosphere, whereupon said bag will no longer contact said walls.
Claim 2
Dependent Claim
107 words
A gas-impervious flexible bag housing a perforated box having a sheet impregnated with an insecticidal material therein, said bag having an inert gas therein of between 30 and 60 cm of mercury, said bag being heat-sealed to contain said inert gas therein, the difference in the pressure within the bag and the ambient pressures surrounding the same causing said bag to engage with the walls of the perforated box and to remain in contact with the walls of said perforated box until such time as the pressure within said bag is at least equal to the surrounding atmosphere, whereupon said bag will no longer contact said walls.
Claim 3
Dependent Claim
35 words
Bag as claimed in claim 1 in which the quantity of oxygen therein is that which remains in the bag after the pressure therein has been reduced to from 1 to 10 cm of mercury.
Claim 4
Dependent Claim
22 words
Bag as claimed in claim 1 which consists of a sheet of plastic material comprising several superposed layers of different plastic materials.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |