# US 12,109,582 B2 · Fog-generating system equipped with safety and regulating devices of the flow-rate of its fog-generating fluid

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- Number: US 12,109,582 B2
- Document ID: US12109582B2
- Status: Granted
- Kind: B2
- Application number: 17/612,662
- Filed: 2020-04-22
- Published: 2022-07-14
- Granted: 2024-10-08
- Earliest claimed: 2019-06-14
- Applicants: Ur Fog S.R.L.
- Inventors: Giovanni Balestrini; Mauro Lombardo; Marco Zangirolami
- Web page: https://patentgrep.com/patent/US12109582B2

## CPC

- B05B 9/002: {incorporating means for heating or cooling, e.g. the material to be sprayed}
- B05B 9/0403: {with pumps for liquids or other fluent material (B05B9/043 takes precedence)}
- B05B 12/08: responsive to condition of liquid or other fluent material {to be} discharged, of ambient medium or of target {; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means}
- A63J 5/025: {Devices for making mist or smoke effects, e.g. with liquid air (for camouflage F41H9/06)}
- F41H 9/06: Apparatus for generating artificial fog or smoke screens ({for producing special effects on stages A63J5/00}; smoke-pot projectors, e.g. arranged on vehicles, F42B5/155)
- G08B 15/02: with smoke, gas, or coloured or odorous powder or liquid
- B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D)
- A63J: DEVICES FOR THEATRES, CIRCUSES, OR THE LIKE; CONJURING APPLIANCES OR THE LIKE
- F41H: ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS

## Abstract

A fog-generating system (1) is described, comprising: a tank (5) containing fog-generating fluid; a pump (3) connected to the tank (5) to withdraw the fog-generating fluid therefrom; a serpentine (2) connected to the pump (3) to receive the fog-generating fluid pumped by the pump (3), the serpentine (2) being divided into a first section (A) connected to the pump (3) and a second section (B) connected to the first section (A) and designed to emit dry fog (7) as output; a battery (6) connected to the serpentine (2) to pass electric current inside the serpentine (2) and to supply the pump (3); a differential amplifier (11) connected to the second section (B); and a threshold comparator (13) which, upon exceeding a certain voltage, a stop index of the serpentine (2) in the second section (B), breaks the supply to the pump (3).

## Claims

### Claim 1

A fog-generating system (1) comprising:
at least one tank (5) containing fog-generating fluid;
at least one pump (3) connected to said at least one tank (5) and designed to withdraw said fog generating fluid therefrom;
at least one serpentine (2) connected to said at least one pump (3) and designed to receive said fog-generating fluid pumped by said pump (3), said serpentine (2) being divided into a first section (A) connected to said pump (3) and a second section (B) connected to said first section (A) and designed to emit dry fog (7) as output; and
at least one battery (6) operatively connected to said at least one serpentine (2) and designed to pass electric current inside said serpentine (2) and to supply said pump (3), wherein a supply of said pump (3) is taken from a resistive divider obtained from said second section (B) of the serpentine (2), and, till the serpentine (2) remains dry, it is uniformly heated and its resistance proportionally increases, while, when the fog-generating fluid gets in contact with said first section (A), its heating and the following status change prevent the first section (A) from being overheated, limiting its resistance increase, and the second section (B), instead, is affected only by its vapour phase, and will be heated more, increasing the voltage at its terminals, so that the pump (3) has a supply voltage as higher as the second section (B) is more “dry”, and consequently increases the flow-rate till a balance point is found between temperature distribution and flow-rate.

### Claim 2 (depends on 1)

The fog-generating system (1) according to claim 1, further comprising:
at least one differential amplifier (11) operatively connected to said second section (B), said differential amplifier (11) taking a control signal from said serpentine (2) and adapting it, through amplification or reduction, to a supply of said pump (3); and
at least one threshold comparator (13) operatively connected to said differential amplifier (11) and to said pump (3), said threshold comparator (13), upon exceeding a certain voltage, which is a stop index of said serpentine (2) in the second section (B), being designed to break the supply to the pump (3).

### Claim 3 (depends on 1)

The fog-generating system (1) according to claim 1, wherein said serpentine (2) is immersed in an inert material and inside a refractory container, which insulates it from atmospheric oxygen, with a flame retardant function.

### Claim 4 (depends on 1)

The fog-generating system (1) according to claim 1, wherein said serpentine (2) is made of conductive material.

### Claim 5 (depends on 1)

The fog-generating system (1) according to claim 1, wherein said divider obtained from said second section (B) is made of austenitic stainless steel, or of any metallic material with a sufficiently high melting point.