Patent US3666713A successfully refreshed from Google Patents.
US3666713A
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Ultraviolet light inhibitors
Assignee: 3M Co
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Filing: 1970-08-18
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Granted: 1972-05-30
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Expires: 1990-08-18
Abstract
Abstract Ultraviolet light absorbers with extremely low volatility are prepared by reacting 2,4-dihydroxybenzophenone and organic dihalides or diepoxides. The resultant compounds have the general formula WHERE R is a divalent organic radical. These compounds may be used as carriers for dye, permitting the internal coloring of polyester films and fibers.
Inventors
- 👤 Robert L Wear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:22
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/132; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/70; C07C45/71; C07D; C07D305/00; C07D305/02; C07D305/04; C07D305/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
12 words
The product of claim 1 wherein the thermoplastic polymer is polyethylene terephthalate.
Claim 2
Dependent Claim
11 words
An oriented film formed from the UV-inhibited polymer of claim 1.
Claim 3
Dependent Claim
16 words
The UV-inhibited polymer of claim 1, additionally containing a dye which is soluble in the inhibitor.
Claim 4
Dependent Claim
11 words
A fiber formed from the dyed UV-inhibited polymer of claim 4.
Claim 5
Dependent Claim
11 words
A film formed from the dyed UV-inhibited polymer of claim 4.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |