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Purhonen; Matti
Helsinki, FI
No. of patents:

Patent Number Title Of Patent Date Issued
D287159 Valve for equalizing pressure resulting from explosions or blasts December 9, 1986
4733606 Closure device March 29, 1988
A closure device for shelters and the like. The frame (1) of the closure device is provided with at least one flow-through passage (2); a closure (3) is mounted displaceably in each passage; and a counter part is formed in the frame for each closure. The closure is displaceable between a
4109754 Noise absorber for air or gas flows August 29, 1978
A noise absorber for air or gas flows, which comprises a flow channel provided at opposite ends with flow inlet and outlet connections. One pair of opposite walls of the flow channel extends concavely and the other pair of opposite walls extends convexly from the inlet connection to the

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