Sulphur dioxide generators

Stock material or miscellaneous articles – Hollow or container type article

Reexamination Certificate

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C428S034200, C428S034400, C428S035200, C428S035700, C206S000600, C206S000700, C426S127000, C426S323000, C099S467000, C099S485000, C422S305000, C422S040000, C424S405000, C424S409000, C424S410000, C424S411000, C424S414000, C424S416000

Reexamination Certificate

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07045182

ABSTRACT:
A sulphur dioxide generator (10) is disclosed which comprises two composite sheets (12, 14). First stage release of sulphur dioxide is from a coating (26) of the composite sheet (14). The coating (26) is between a paper sheet (22) and a weldable coating (24). The coating (26) incorporates a substance which, in the presence of moisture, generates sulphur dioxide. Second stage release is from sulphur dioxide generating powder which is in pockets (30). The composite sheet (12) comprises a paper layer (16) and a weldable layer (18). The layers (24, 18) are sealed together along a series of longitudinal and transverse lines to form the pockets (30).

REFERENCES:
patent: 4041209 (1977-08-01), Scholle
patent: 4487791 (1984-12-01), Komatsu et al.
patent: 4748904 (1988-06-01), Razeto et al.
patent: 5106596 (1992-04-01), Clemes
patent: 5711211 (1998-01-01), Ide et al.
patent: 6033705 (2000-03-01), Isaacs
patent: 6046243 (2000-04-01), Wellinghoff et al.
patent: 0 292 948 (1988-11-01), None
patent: 0 571 228 (1993-11-01), None

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