US4151233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing a smoke agent
Assignee: United States Department of the Army
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Filing: 1977-10-19
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Granted: 1979-04-24
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Expires: 1997-10-19
Abstract
Abstract An improved method for preparing a "plasticized" red phosphorous smoke ag through the steps comprising mixing particulate red phosphorous with a non-swollen, commercial latex polymer "plasticizer." In the preferred embodiment the latex polymer plasticizer is a butyl rubber.
Inventors
- 👤 Raymond R. Fry, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:36
CPC Classifications
C; C06; C06D; C06D3/00; C06B; C06B39/00; C06B45/00; C06B45/04; C06B45/06; C06B45/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
44 words
A method for preparing a red phosphorous smoke agent wherein particulate red phosphorous is coated with a polymer consisting essentially of the step of mixing particulate red phosphorous with a non-swollen rubber latex selected from the group consisting of natural and synthetic rubber latex.
Claim 2
Independent Claim
44 words
A method for preparing a red phosphorous smoke agent wherein particulate red phosphorous is coated with a polymer consisting essentially of the step of mixing particulate red phosphorous with a non-swollen rubber latex selected from the group consisting of natural and synthetic rubber latex.
Claim 3
Dependent Claim
40 words
The method of claim 1 wherein the red phosphorous is present in an amount of from 32 to 92 percent and the latex (contains 63% polymer) is present in an amount of from 68 to 8 percent of the mixture.
Claim 4
Dependent Claim
20 words
The method of claim 2 further including the step of adding a curative to the red phosphorous and latex mixture.
Claim 5
Dependent Claim
19 words
The method of claim 3 wherein the curative is present in an amount of 1 percent of the mixture.
Claim 6
Dependent Claim
37 words
The method of claim 4 wherein the mixture is dried to give a red phosphorous smoke agent composition containing 75 to 95 percent red phosphorous, 25 to 5 percent latex polymer and 0 to 1 percent curative.
Claim 7
Dependent Claim
23 words
The method of claim 5 wherein the mixture is dried by heating in an oven at 90° to 100° C. for two hours.
Claim 8
Dependent Claim
41 words
The method of claim 5 further including the step of extruding the mixture after it has been dried to about 9.0 percent moisture to produce a red phosphorous smoke agent pellet containing 95 percent red phosphorous and 5 percent latex polymer.
Claim 9
Dependent Claim
22 words
The method of claim 7 wherein the step of extruding the mixture is performed through use of a high energy pellet mill.
Claim 10
Dependent Claim
22 words
The method of claim 7 further including the step of curing the red phosphorous pellet by completely drying said red phosphorous pellet.
Claim 11
Dependent Claim
21 words
The method of claim 9 wherein the curing is performed by oven drying at 90° to 100° C. for two hours.
Claim 12
Dependent Claim
12 words
The method of claim 5 wherein the latex polymer is butyl rubber.
Claim 13
Dependent Claim
13 words
The method of claim 7 wherein the latex polymer plasticizer is butyl rubber.
References Cited (Backward Citations)
US2574466A
Cited
US3932242A
Cited
US3650855A
Cited
US3736194A
Cited
US3488711A
Cited
US3657027A
Cited
US3650856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |