US4978568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible writing surface
Assignee: Hach Associates Inc
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Filing: 1989-02-22
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Granted: 1990-12-18
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Expires: 2009-02-22
Abstract
Abstract A flexible writing surface including a coated flexible substrate having a dust collecting cuff around the perimeter thereof to prevent the scattering of chalk dust during use.
Inventors
- 👤 Robert C. Postma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:27
CPC Classifications
B; B43; B43L; B43L1/00; B43L1/04; B43L1/08; Y; Y10; Y10S; Y10S428/00; Y10S428/908; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24736; Y10T428/24777; Y10T428/24802; Y10T428/2481; Y10T428/24942; Y10T428/31504; Y10T428/31551; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
A flexible writing surface comprising a four-sided flexible sheet material having a coating composition thereon characterized by its adherence to said flexible sheet material so as to provide a durable chalk writing and marking surface thereon, said flexible writing surface further comprising flexible dust collecting means extending along and adjacent to at least two sides of said flexible sheet material.
Claim 2
Dependent Claim
60 words
A flexible writing surface comprising a four-sided flexible sheet material having a coating composition thereon characterized by its adherence to said flexible sheet material so as to provide a durable chalk writing and marking surface thereon, said flexible writing surface further comprising flexible dust collecting means extending along and adjacent to at least two sides of said flexible sheet material.
Claim 3
Dependent Claim
18 words
A flexible writing surface according to claim 1 wherein the sheet material is a flexible textured vinyl fabric.
Claim 4
Dependent Claim
16 words
A flexible writing surface according to claim 1 wherein said vinyl fabric has a stippled pattern.
Claim 5
Dependent Claim
16 words
A flexible writing surface according to claim 1 wherein the coating composition is a polymeric composition.
Claim 6
Dependent Claim
17 words
A flexible writing surface according to claim 1 wherein the polymeric composition is a urethane polymeric composition.
Claim 7
Dependent Claim
17 words
A flexible writing surface according to claim 1 wherein the polymeric composition is an acrylic polymeric composition.
Claim 8
Dependent Claim
23 words
A flexible writing surface according to claim 1 wherein the flexible sheet material has a thickness of between about 0.05 and 0.20 mm.
Claim 9
Dependent Claim
29 words
A flexible writing surface according to claim 1 wherein said dust-collecting means comprises a cuff defined by the edge of said sheet material having been turned back upon itself.
Claim 10
Dependent Claim
57 words
A flexible writing surface comprising a four-sided flexible sheet material having a coating composition thereon characterized by its adherence to said flexible sheet material so as to provide a durable chalk writing and marking surface thereon, said flexible writing surface further comprising a flexible dust collecting cuff extending around the entire perimeter of said flexible sheet material.
Claim 11
Dependent Claim
57 words
A flexible writing surface comprising a four-sided flexible sheet material having a coating composition thereon characterized by its adherence to said flexible sheet material so as to provide a durable chalk writing and marking surface thereon, said flexible writing surface further comprising a flexible dust collecting cuff extending around the entire perimeter of said flexible sheet material.
References Cited (Backward Citations)
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US3497969A
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US3642562A
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US3922457A
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US4066820A
Cited
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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) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |