Patent US3687370A successfully refreshed from Google Patents.
US3687370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid mixing and dispensing apparatus
Assignee: Instapak Corp
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Filing: 1971-01-18
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Granted: 1972-08-29
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Expires: 1991-01-18
Abstract
Abstract An apparatus for mixing and spraying or dispensing two liquids, such as liquid organic resins and polyisocyanates which react to form a polyurethane foam. The apparatus comprises a gun and related equipment and includes a reciprocally mounted valving rod in the gun which during its movement is bathed in a third liquid which assures the easy movement of the rod. In the case of the organic resin and polyisocyanates, the third liquid which is known as ''''cellosolve'''' solvent prevents the reaction of the reagents thereby preventing the formation of polyurethane foam within the dispensing apparatus which formation would inhibit the movement of the valving rod. The valving rod is such that the free end thereof controls the on/off flow of the two liquids into a mixing chamber.
Inventors
- 👤 Charles R Sperry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:25
CPC Classifications
B; B05; B05B; B05B7/00; B05B7/02; B05B7/12; B05B7/1254; B05B7/1263; B05B15/00; B05B15/50; B05B15/52; B05B15/522; B05B15/5223; B05B15/5225; B05B15/55; B29; B29B; B29B7/00; B29B7/74; B29B7/76; B29B7/7663; B29B7/7673; B29B7/7678; B29B7/80; B29B7/802; B29B7/803
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
44 words
The apparatus as claimed in claim 1 wherein said means for moving said valving rod includes means defining a cylinder and a piston reciprocal within said cylinder and wherein the rearward end of the valving rod is mounted to said piston for movement therewith.
Claim 2
Dependent Claim
16 words
The apparatus as claimed in claim 2 wherein pneumatic means are provided for moving said piston.
Claim 3
Dependent Claim
62 words
The apparatus as recited in claim 3 wherein said pneumatic means include: a. a source of compressed air, and b. a handle and trigger assembly associated with said cylinder and said source of compressed aIr so that upon actuation of the trigger, the piston is caused to move rearwardly and upon release of the trigger the piston is caused to move forwardly.
Claim 4
Dependent Claim
26 words
The apparatus as recited in claim 1 wherein the reservoir includes a slotted member for guiding said valving rod in its reciprocating movement within said reservoir.
Claim 5
Dependent Claim
24 words
The apparatus as recited in claim 5 wherein at all times at least a portion of said rod is disposed within said slotted member.
Claim 6
Dependent Claim
29 words
The apparatus as defined in claim 1, wherein in the closed position the forward end of the valving rod is flush with the outlet end of said mixing chamber.
Claim 7
Dependent Claim
31 words
The apparatus as recited in claim 1 wherein a cleaning material is disposed within said reservoir and a portion of the valving rod within the reservoir is contacted by said material.
Claim 8
Dependent Claim
17 words
The apparatus as recited in claim 8 wherein said reaction preventative material is ethylene glycol monoethyl ether.
Claim 9
Dependent Claim
60 words
The apparatus as recited in claim 1 and in combination therewith: a. a pressurized source of liquid organic resin in communication with at least one entrance port; b. a pressurized source of liquid isocyanate in communication with at least one other entrance port; and c. pneumatic means for reciprocating said valving rod which means include a source of compressed air.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |