US4598006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for impregnating a thermoplastic polymer
Assignee: Hercules LLC
•
Filing: 1985-05-02
•
Granted: 1986-07-01
•
Expires: 2005-05-02
Abstract
Abstract Disclosed is a method for impregnating a thermoplastic polymer with an impregnation material such as a fragrance or pest control agent or pharmaceutical composition. A thermoplastic polymer is impregnated by (1) dissolving an impregnation material such as a fragrance or pest control agent or pharmaceutical composition material in a volatile swelling agent maintained at or near supercritical conditions for the volatile swelling agent, (2) swelling the thermoplastic polymer by contacting it at or near supercritical conditions for the volatile swelling agent with the impregnation material-laden volatile swelling agent and then (3) reducing the pressure so that the volatile swelling agent diffuses out of the thus impregnated thermoplastic polymer.
Inventors
- 👤 Michael L. Sand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:38
CPC Classifications
B; B29; B29C; B29C71/00; A; A61; A61K; A61K9/00; A61K9/70; A61K9/7007; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/042; C; C08; C08J; C08J7/00; C08J7/04; C08J7/06; C08J7/065; D; D06; D06M; D06M23/00; D06M23/10; D06M23/105; B29C71/0009; B29C2071/0018; B29C2071/0054; B29K; B29K2105/00; B29K2105/0005; B29K2105/0011; B29K2105/0029; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/54
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
A method of forming an impregnated thermoplastic polymer, comprising: dissolving an impregnation material in a volatile swelling agent maintained at or near supercritical conditions for the volatile swelling agent, said impregnation material being selected from the group consisting of fragrances, pest control agents and pharmaceuticals; swelling the thermoplastic polymer by contacting it with the impregnation material-laden volatile swelling agent at or near supercritical conditions for the volatile swelling agent; and reducing the pressure whereby the volatile swelling agent diffuses out of the impregnated thermoplastic polymer.
Claim 2
Independent Claim
85 words
A method of forming an impregnated thermoplastic polymer, comprising: dissolving an impregnation material in a volatile swelling agent maintained at or near supercritical conditions for the volatile swelling agent, said impregnation material being selected from the group consisting of fragrances, pest control agents and pharmaceuticals; swelling the thermoplastic polymer by contacting it with the impregnation material-laden volatile swelling agent at or near supercritical conditions for the volatile swelling agent; and reducing the pressure whereby the volatile swelling agent diffuses out of the impregnated thermoplastic polymer.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said impregnation material is a perfume.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein said impregnation material is a fruit fragrance.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said impregnation material is a flower fragrance.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein said impregnation material is a pest control agent.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein said impregnation material is a pharmaceutical.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein said swelling agent is carbon dioxide.
Claim 9
Dependent Claim
12 words
The method of claim 1 wherein said swelling agent is nitrous oxide.
Claim 10
Dependent Claim
10 words
The method of claim 6 wherein said pharmaceutical is scopolamine.
References Cited (Backward Citations)
US3553296A
Cited
US3876761A
Cited
US3775227A
Cited
US3804796A
Cited
US4051159A
Cited
US4095031A
Cited
JPS5620055A
Cited
US4515909A
Cited
US4460572A
Cited
US4521541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |