US3929480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous tone ZnO - acrylic polymer binder and additive
Assignee: Dennison Manufacturing Co
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Filing: 1974-08-05
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Granted: 1975-12-30
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Expires: 1994-08-05
Abstract
Abstract Electrophotographic continuous tone reproduction sheet in which the coating composition therefor includes continuous tone zinc oxide pigments, an insulating polymer resin binder selected to provide uniform optical density of the finished product, and in addition preferably includes an additive to enhance the optical density properties of the finished product.
Inventors
- 👤 Barry R Perlis
- 👤 Michael E Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:21
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0532; G03G5/0535; G03G5/0546
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
47 words
AN ELECTROPHOTOGRAPHIC REPRODUCTION SHEET HAVING AN ELECTROPHOTOGRAPHIC COATING CONSISTING ESSENTIALLY OF CONTINUOUS TONE ZINC OXIDE PIGMENT PROVIDING ABOUT 15 OR MORE STEPS ON A 21-STEP PHOTOGRAPHIC GRAY SCALE OF 0.15 (O.D.) INCREMENTS, AN INSULATING ACRYLIC POLYMER BINDER THEREFOR AND A POLYMER RESIN ADDITIVE HAVING THE REPEATING UNIT
Claim 2
Dependent Claim
47 words
AN ELECTROPHOTOGRAPHIC REPRODUCTION SHEET HAVING AN ELECTROPHOTOGRAPHIC COATING CONSISTING ESSENTIALLY OF CONTINUOUS TONE ZINC OXIDE PIGMENT PROVIDING ABOUT 15 OR MORE STEPS ON A 21-STEP PHOTOGRAPHIC GRAY SCALE OF 0.15 (O.D.) INCREMENTS, AN INSULATING ACRYLIC POLYMER BINDER THEREFOR AND A POLYMER RESIN ADDITIVE HAVING THE REPEATING UNIT
Claim 3
Dependent Claim
14 words
A sheet according to claim 1 where R1 is CH3 and R2 is hydrogen.
Claim 4
Dependent Claim
25 words
A sheet according to claim 1 where R1 is hydrogen and R2 is CH3 at the ortho, meta or para position of the phenyl ring.
Claim 5
Dependent Claim
22 words
A sheet according to claim 1 in which the resin additIve is 10 to 30% by weight of the polymer binder solids.
Claim 6
Dependent Claim
15 words
A sheet according to claim 1 in which the polymer binder is a styrene-acrylate resin.
Claim 7
Dependent Claim
17 words
A sheet according to claim 1 in which the polymer binder is a styrene ethyl acrylate resin.
Claim 8
Dependent Claim
44 words
An electrophotographic sheet according to claim 1 in which the base paper has a weight of 35 to 90 lbs. per 3000 sq. ft. ream and wherein the coating is applied at a weight between 12 to 25 lbs. per 3000 sq. ft. ream.
Claim 9
Dependent Claim
15 words
An electrophotographic sheet according to claim 1 in which the coating contains a sensitizing dye.
References Cited (Backward Citations)
US3347670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |