US4534802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purge/solvent bath method
Assignee: Olin Corp
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Filing: 1984-01-23
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Granted: 1985-08-13
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Expires: 2004-01-23
Abstract
Abstract A method of dispensing plural component polyurethane foam is disclosed wherein the working parts are cleaned by a combination of air purging and immersion in a static solvent bath.
Inventors
- 👤 William J. Gates
- 👤 John F. Zwirlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:41
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/74; B29B7/7438; B29B7/7447; B05; B05B; B05B12/00; B05B12/14; B05B12/1418; B05B15/00
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
170 words
A method of operating a plural component dispensing apparatus utilizing a mixing gas of predetermined pressure that mixes the plural components prior to dispensing to ensure the cleaning out of residual material, comprising the steps of: (a) dispensing a shot of predetermined duration of the mixed plural components; (b) delaying for a predetermined duration after dispensing the shot; (c) dispensing a blast of purging gas under pressure for a predetermined duration through at least a portion of the dispensing apparatus; (d) stopping the flow of mixing gas through the dispensing apparatus; (e) venting the mixing gas from the dispensing apparatus; (f) immersing at least a portion of the discharge nozzle of the dispensing apparatus in a static solvent bath for a predetermined period of time to permit the solvent to displace the vented mixing gas by traveling up the discharge nozzle; (g) removing the dispensing apparatus from the static solvent bath; (h) activating the mixing gas; and (i) dispensing a second shot of predetermined duration of the mixed plural components.
Claim 2
Independent Claim
170 words
A method of operating a plural component dispensing apparatus utilizing a mixing gas of predetermined pressure that mixes the plural components prior to dispensing to ensure the cleaning out of residual material, comprising the steps of: (a) dispensing a shot of predetermined duration of the mixed plural components; (b) delaying for a predetermined duration after dispensing the shot; (c) dispensing a blast of purging gas under pressure for a predetermined duration through at least a portion of the dispensing apparatus; (d) stopping the flow of mixing gas through the dispensing apparatus; (e) venting the mixing gas from the dispensing apparatus; (f) immersing at least a portion of the discharge nozzle of the dispensing apparatus in a static solvent bath for a predetermined period of time to permit the solvent to displace the vented mixing gas by traveling up the discharge nozzle; (g) removing the dispensing apparatus from the static solvent bath; (h) activating the mixing gas; and (i) dispensing a second shot of predetermined duration of the mixed plural components.
Claim 3
Dependent Claim
22 words
The method according to claim 1 further comprising delaying after dispensing a shot for about 1 to about 4 seconds in duration.
Claim 4
Dependent Claim
24 words
The method according to claim 1 further comprising dispensing of the blast of purging gas from about 1 to about 4 seconds in duration.
Claim 5
Dependent Claim
14 words
The method according to claim 1 further comprising using air as the mixing gas.
Claim 6
Dependent Claim
14 words
The method according to claim 4 further comprising using air as the purging gas.
Claim 7
Dependent Claim
48 words
The method according to claim 1 further comprising dispensing the blast of purging gas under pressure through a dispensing apparatus having a mixing chamber, orifice plate, discharge plate, and discharge nozzle such that the purging gas passes through said mixing chamber, orifice plate, discharge plate and discharge nozzle.
Claim 8
Independent Claim
31 words
The method according to claims 5 or 6 further comprising dispensing the purging gas at a pressure of about 60 pounds per square inch to about 85 pounds per square inch.
Claim 9
Independent Claim
31 words
The method according to claims 5 or 6 further comprising dispensing the purging gas at a pressure of about 75 pounds per square inch to about 85 pounds per square inch.
Claim 10
Independent Claim
24 words
The method according to claims 5 or 6 further comprising dispensing the purging gas at a pressure of about 80 pounds per square inch.
Claim 11
Dependent Claim
49 words
The method according to claim 1 further comprising stopping the flow of mixing gas through the dispensing apparatus and venting the mixing gas concurrently by activating a pneumatic solenoid valve prior to immersing at least a portion of the discharge nozzle of the dispensing apparatus in the solvent bath.
Claim 12
Dependent Claim
28 words
The method according to claim 10 further comprising activating the mixing gas by deactivating the pneumatic solenoid valve concurrently with removing the dispensing apparatus from the solvent bath.
Claim 13
Independent Claim
158 words
A method of cleaning a plural component foam dispensing apparatus after a shot of foam has been dispensed, the apparatus further utilizing a mixing gas of predetermined pressure to mix the plural components prior to dispensing the foam, comprising the steps of: (a) delaying for a predetermined duration after dispensing the foam; (b) dispensing a blast of purging gas under pressure for a predetermined duration through at least a portion of the dispensing apparatus; (c) venting the mixing gas and purging gas from the dispensing apparatus; (d) immersing at least a portion of the dispensing apparatus in a static, non-circulating solvent bath for a predetermined period of time to permit the solvent to displace the vented mixing gas and purging gas by traveling up at least a portion of the dispensing apparatus; (e) removing the dispensing apparatus from the static solvent bath; and (f) directing the mixing gas back through at least a portion of the dispensing apparatus.
Claim 14
Independent Claim
158 words
A method of cleaning a plural component foam dispensing apparatus after a shot of foam has been dispensed, the apparatus further utilizing a mixing gas of predetermined pressure to mix the plural components prior to dispensing the foam, comprising the steps of: (a) delaying for a predetermined duration after dispensing the foam; (b) dispensing a blast of purging gas under pressure for a predetermined duration through at least a portion of the dispensing apparatus; (c) venting the mixing gas and purging gas from the dispensing apparatus; (d) immersing at least a portion of the dispensing apparatus in a static, non-circulating solvent bath for a predetermined period of time to permit the solvent to displace the vented mixing gas and purging gas by traveling up at least a portion of the dispensing apparatus; (e) removing the dispensing apparatus from the static solvent bath; and (f) directing the mixing gas back through at least a portion of the dispensing apparatus.
Claim 15
Dependent Claim
22 words
The method according to claim 12 further comprising delaying after dispensing the foam for about 1 to about 4 seconds in duration.
Claim 16
Dependent Claim
23 words
The method according to claim 12 further comprising dispensing the blast of purging gas from about 1 to about 4 seconds in duration.
Claim 17
Dependent Claim
14 words
The method according to claim 12 further comprising using air as the mixing gas.
Claim 18
Dependent Claim
14 words
The method according to claim 15 further comprising using air as the purging gas.
Claim 19
Independent Claim
31 words
The method according to claims 12 or 16 further comprising dispensing the purging gas at a pressure of about 60 pounds per square inch to about 85 pounds per square inch.
Claim 20
Independent Claim
31 words
The method according to claims 12 or 16 further comprising dispensing the purging gas at a pressure of about 75 pounds per square inch to about 85 pounds per square inch.
Claim 21
Independent Claim
24 words
The method according to claims 12 or 16 further comprising dispensing the purging gas at a pressure of about 80 pounds per square inch.
Claim 22
Dependent Claim
32 words
The method according to claim 12 further comprising stopping the flow of mixing gas through the dispensing apparatus after dispensing the blast of purging gas and prior to venting the mixing gas.
Claim 23
Dependent Claim
37 words
The method according to claim 12 further comprising venting the mixing gas from the dispensing apparatus by activating a pneumatic solenoid valve concurrently with immersing at least a portion of the dispensing apparatus in the solvent bath.
Claim 24
Dependent Claim
49 words
The method according to claim 20 further comprising stopping the flow of mixing gas through the dispensing apparatus and venting the mixing gas from the dispensing apparatus concurrently by activating a pneumatic solenoid valve prior to immersing at least a portion of the dispensing apparatus in the solvent bath.
Claim 25
Dependent Claim
38 words
The method according to claim 12 further comprising directing the mixing gas back through at least a portion of the dispensing apparatus concurrently with removing the dispensing apparatus from the solvent bath by deactivating the pneumatic solenoid valve.
Claim 26
Independent Claim
31 words
The method according to claims 1 or 12 further comprising immersing at least a portion of the dispensing apparatus in a solvent bath using diethylene glycol monomethyl ether as the solvent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |