US4134853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photochromic composition
Assignee: Individual
•
Filing: 1976-12-30
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Granted: 1979-01-16
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Expires: 1996-12-30
Abstract
Abstract A photochromic composition consisting essentially of titanium dioxide, ferric oxide and lead nitrate. This photochromic compositon can be combined with moldable materials such as a plastisol and formed into toys, such as dolls.
Inventors
- 👤 Robert Ehrlich
- 👤 Melvin Ehrlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:15
CPC Classifications
A; A63; A63H; A63H9/00; C; C09; C09K; C09K9/00; G; G03; G03C; G03C1/00; G03C1/705
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
53 words
A photochromic composition consisting essentially of the calcined mixture of the anatase form of titanium dioxide, ferrous oxide in the range of about 2% to 10% of the weight of the anatase form of titanium dioxide and lead oxide in the range of about 0.1% to 1% of the weight of titanium dioxide.
Claim 2
Dependent Claim
53 words
A photochromic composition consisting essentially of the calcined mixture of the anatase form of titanium dioxide, ferrous oxide in the range of about 2% to 10% of the weight of the anatase form of titanium dioxide and lead oxide in the range of about 0.1% to 1% of the weight of titanium dioxide.
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein said composition includes 0.2% by weight of lead oxide to the weight of the anatase form of titanium dioxide.
Claim 4
Dependent Claim
89 words
A photochromic plastic composition consisting essentially of: a plastic material and a photochromic composition in the plastic material in the range of about 1% to 50% by weight of the plastic material said photochromic composition consisting essentially of the calcined mixture of the anatase form of titanium dioxide, ferrous oxide in the range of about 2% to 10% of the weight of the anatase form of titanium dioxide and lead oxide in the range of about 0.1% to 1% of the weight of the anatase form of titanium dioxide.
Claim 5
Dependent Claim
89 words
A photochromic plastic composition consisting essentially of: a plastic material and a photochromic composition in the plastic material in the range of about 1% to 50% by weight of the plastic material said photochromic composition consisting essentially of the calcined mixture of the anatase form of titanium dioxide, ferrous oxide in the range of about 2% to 10% of the weight of the anatase form of titanium dioxide and lead oxide in the range of about 0.1% to 1% of the weight of the anatase form of titanium dioxide.
Claim 6
Dependent Claim
93 words
A doll formed of a photochromic plastic composition consisting essentially of: a plastic material and a photochromic composition in the plastic material in the range of about 1% to 50% by weight of the plastic material, said photochromic composition consisting essentially of the calcined mixture of the anatase form of titanium dioxide, ferrous oxide in the range of about 2% to 10% of the weight of the anatase form of titanium dioxide and lead oxide in the range of about 0.1% to 1% of the weight of the anatase form of titanium dioxide.
Claim 7
Dependent Claim
93 words
A doll formed of a photochromic plastic composition consisting essentially of: a plastic material and a photochromic composition in the plastic material in the range of about 1% to 50% by weight of the plastic material, said photochromic composition consisting essentially of the calcined mixture of the anatase form of titanium dioxide, ferrous oxide in the range of about 2% to 10% of the weight of the anatase form of titanium dioxide and lead oxide in the range of about 0.1% to 1% of the weight of the anatase form of titanium dioxide.
Claim 8
Independent Claim
23 words
The method of forming a photochromic composition by calcining a mixture of the anatase form of titanium dioxide, ferric oxide and lead nitrate.
Claim 9
Independent Claim
23 words
The method of forming a photochromic composition by calcining a mixture of the anatase form of titanium dioxide, ferric oxide and lead nitrate.
Claim 10
Independent Claim
54 words
The method of forming a photochromic composition comprising the steps of forming a slurry of the anatase form of titanium dioxide, adding ferric oxide and lead nitrate to said slurry, evaporating the excess water from said slurry, calcining the resulting mixture for a time and at a temperature sufficient to form a photochromic composition.
Claim 11
Independent Claim
54 words
The method of forming a photochromic composition comprising the steps of forming a slurry of the anatase form of titanium dioxide, adding ferric oxide and lead nitrate to said slurry, evaporating the excess water from said slurry, calcining the resulting mixture for a time and at a temperature sufficient to form a photochromic composition.
Claim 12
Dependent Claim
27 words
The method of forming a photochromic composition as set forth in claim 6 wherein the ferric oxide is up to 10% by weight of the titanium dioxide.
Claim 13
Dependent Claim
29 words
The method of forming a photochromic composition in accordance with claim 7, wherein the weight of lead nitrate is up to 1% of the weight of the titanium dioxide.
Claim 14
Independent Claim
83 words
The method of forming a photochromic composition including the steps of forming a slurry of the anatase form of titanium dioxide, adding to said slurry up to 10% by weight of ferric oxide and up to 1% by weight of lead nitrate, drying said slurry to drive off excess water, calcining said dried slurry at temperature of at least 1000° for a time sufficient to form a photochromic composition consisting essentially of the anatase form of titanium dioxide, ferrous oxide and lead oxide.
Claim 15
Independent Claim
83 words
The method of forming a photochromic composition including the steps of forming a slurry of the anatase form of titanium dioxide, adding to said slurry up to 10% by weight of ferric oxide and up to 1% by weight of lead nitrate, drying said slurry to drive off excess water, calcining said dried slurry at temperature of at least 1000° for a time sufficient to form a photochromic composition consisting essentially of the anatase form of titanium dioxide, ferrous oxide and lead oxide.
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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) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |