US3876608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic films containing spherical inorganic particles of 2 to 10 micron size
Assignee: Eastman Kodak Co
•
Filing: 1972-05-26
•
Granted: 1975-04-08
•
Expires: 1992-05-26
Abstract
Abstract Polymeric film having incorporated therein quantities of inert filler having substantially uniform particle size and an average particle size of at least 2 microns, the film being characterized by improved winding and optical properties.
Inventors
- 👤 Jerrel Charles Anderson
- 👤 Ralph Kingsley Iler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:21
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; C; C08; C08J; C08J5/00; C08J5/18; Y; Y10; Y10S; Y10S260/00; Y10S260/35
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
49 words
A POLYMERIC THERMOPLASTIC FILM HAVING DISPERSED THEREIN ABOUT 5 TO 300 PARTS PER MILLION OF SUBSTANTIALLY SPHERICAL, INERT, INORGANIC PARTICLES HAVING AN AVERAGE PARTICLE SIZE OF ABOUT 2 TO 10 MICRONS, AT LEAST 50% OF THE PARTICLES HAVING A PARTICLE SIZE WITHIN 1 MICRON OF THE AVERAGE PARTICLE SIZE.
Claim 2
Dependent Claim
49 words
A POLYMERIC THERMOPLASTIC FILM HAVING DISPERSED THEREIN ABOUT 5 TO 300 PARTS PER MILLION OF SUBSTANTIALLY SPHERICAL, INERT, INORGANIC PARTICLES HAVING AN AVERAGE PARTICLE SIZE OF ABOUT 2 TO 10 MICRONS, AT LEAST 50% OF THE PARTICLES HAVING A PARTICLE SIZE WITHIN 1 MICRON OF THE AVERAGE PARTICLE SIZE.
Claim 3
Dependent Claim
20 words
The polymeric film of claim 1 wherein the inert particles consist essentially of refractory metal oxide or aluminosilicate molecular sieve.
Claim 4
Dependent Claim
13 words
The film of claim 2 wherein the inert particles have an average particle
Claim 5
Dependent Claim
26 words
The film of claim 1 also having dispersed therein at least about 100 parts per million of inert material having a particle size of less than
Claim 6
Dependent Claim
34 words
The film of claim 4 wherein the inert material having a particle size of less than 1.0 micron is at least one of silicon dioxide, a tribasic calcium phosphate of the formula 3Ca.sub.3 (PO.sub.4).sub.2.sup..
Claim 7
Dependent Claim
23 words
The film of claim 4 wherein the inert particles having an average particle size of about 2 to 10 microns consist essentially of
Claim 8
Dependent Claim
24 words
The film of claim 4 wherein the inert particles having an average particle size of about 2 to 10 microns consist essentially of refractory
Claim 9
Dependent Claim
12 words
The film of claim 4 wherein the polymeric film is a polyester,
Claim 10
Dependent Claim
11 words
The film of claim 4 wherein the polyester is polyethylene terephthalate.
Claim 11
Dependent Claim
20 words
A polymeric film of claim 1 having bonded to the surface thereof a multiplicity of discrete nodules of silicon dioxide.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |