US4440541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarizer: dichroic dye in oriented polyacrylic acid/chitosan complex sheet
Assignee: 3M Innovative Properties Co
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Filing: 1982-05-20
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Granted: 1984-04-03
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Expires: 2002-05-20
Abstract
Abstract A dichroic light polarizer comprising a sheet of molecularly oriented polyacrylic acid/chitosan complex having incorporated therein a dichroic dye.
Inventors
- 👤 Carl M. Berke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:29
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033; G02B1/00; G02B1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
20 words
A dichroic light polarizer comprising a molecularly oriented sheet of a polyacrylic acid/chitosan polyelectrolyte complex dyed with a dichroic dye.
Claim 2
Dependent Claim
20 words
A dichroic light polarizer comprising a molecularly oriented sheet of a polyacrylic acid/chitosan polyelectrolyte complex dyed with a dichroic dye.
Claim 3
Dependent Claim
14 words
The product of claim 1 wherein said complex is a 1:1 polyacrylic acid:chitosan complex.
Claim 4
Dependent Claim
13 words
The product of claim 1 wherein said dichroic dye is an iodine ink.
Claim 5
Dependent Claim
9 words
The product of claim 1 which includes polyvinyl alochol.
Claim 6
Dependent Claim
9 words
The product of claim 1 which includes a plasticizer.
Claim 7
Dependent Claim
11 words
The product of claim 5 wherein said plasticizer is a polyol.
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) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |