US4824725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drafting material
Assignee: Hoechst AG
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Filing: 1987-12-15
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Granted: 1989-04-25
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Expires: 2007-12-15
Abstract
Abstract Disclosed is a drafting material comprising a transparent base material with a hydrophilic coating which readily accepts ink, ensures rapid drying of the ink and can be marked in a wipe-resistant manner. The hydrophilic coating of the drafting material includes sulfonate group-containing copolyesters which are preferably present in an amount of 30 to 70 percent by weight. The drafting material can be marked with felt-tip pens containing aqueous inks.
Inventors
- 👤 Klaus Thoese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:55
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/50; B41M5/52; B41M5/5263; B41M5/5272; B44; B44D; B44D3/00; B44D3/18; C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/043; C08J7/044; C08J7/046; C08J7/056; C08J2367/00; C08J2367/02; C08J2429/00; C08J2429/02; C08J2429/04; C08J2467/00; C08J2467/02; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31786; Y10T428/31794; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935; Y10T428/31942
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
55 words
A drafting material, comprising: a transparent base material having on at least one surface a hydrophilic coating containing from about 30 to 70 percent by weight of polyvinyl alcohol and from about 70 to 30 percent by weight of a sulfonate-group-containing copolyester; and an adhesion-promoting layer between the transparent base material and the hydrophilic coating.
Claim 2
Dependent Claim
55 words
A drafting material, comprising: a transparent base material having on at least one surface a hydrophilic coating containing from about 30 to 70 percent by weight of polyvinyl alcohol and from about 70 to 30 percent by weight of a sulfonate-group-containing copolyester; and an adhesion-promoting layer between the transparent base material and the hydrophilic coating.
Claim 3
Dependent Claim
23 words
A material as claimed in claim 1, wherein the weight ratio of polyvinyl alcohol to copolyester in the hydrophilic coating is about 1:1.
Claim 4
Dependent Claim
20 words
A material as claimed in claim 1, wherein the hydrophilic coating has a thickness of about 0.5 to 10 μm.
Claim 5
Dependent Claim
20 words
A material as claimed in claim 3, wherein the hydrophilic coating has a thickness of about 2 to 4 μm.
Claim 6
Dependent Claim
15 words
A material as claimed in claim 1, wherein the base material comprises a polyester film.
Claim 7
Dependent Claim
20 words
A material as claimed in claim 5, wherein the base material is a biaxially stretched and heat-set polyethylene terephthalate film.
Claim 8
Dependent Claim
16 words
A material as claimed in claim 1, further comprising a crosslinking agent in the hydrophilic coating.
Claim 9
Dependent Claim
25 words
A material as claimed in claim 7, wherein the crosslinking agent contained in the hydrophilic coating comprises a formaldehyde compound derived from urea or melamine.
Claim 10
Dependent Claim
30 words
A material as claimed in claim 8, wherein the hydrophilic coating comprises about 0.5 to 3 percent by weight, relative to the dry weight of the coating, of crosslinking agent.
Claim 11
Dependent Claim
22 words
A material as claimed in claim 1, further comprising a photosensitive diazonium compound in the hydrophilic coating, in combination with a stabilizer.
Claim 12
Dependent Claim
16 words
A material as claimed in claim 10, further comprising a coupling component in said hydrophilic coating.
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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) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |