Patent US4035652A successfully refreshed from Google Patents.
US4035652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent backing sheet for writing in the dark
Assignee: Individual
•
Filing: 1976-06-21
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Granted: 1977-07-12
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Expires: 1996-06-21
Abstract
Abstract A lined phosphorescent backing sheet for use in underlying relation with writing paper or drawing sheets permitting a writer to write in orderly form in the dark without need for external light.
Inventors
- 👤 Becky J. Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:05
CPC Classifications
F; F21; F21K; F21K2/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A backing sheet for guiding the application of written matter on writing sheets in darkness comprising; a sheet having associated therewith a set of luminescent regions with a set of non-luminescent regions located therebetween which combination in the dark provides a guide for application of intelligible matter to writing sheets placed over the backing sheet, one of said sets of regions being raised above the other an amount sufficient to provide feeling guides spaced for application of written material therebetween which guides can be felt through writing sheets placed thereover in addition to providing visible guides in the dark for guiding the application of written matter on said writing sheets.
Claim 2
Dependent Claim
110 words
A backing sheet for guiding the application of written matter on writing sheets in darkness comprising; a sheet having associated therewith a set of luminescent regions with a set of non-luminescent regions located therebetween which combination in the dark provides a guide for application of intelligible matter to writing sheets placed over the backing sheet, one of said sets of regions being raised above the other an amount sufficient to provide feeling guides spaced for application of written material therebetween which guides can be felt through writing sheets placed thereover in addition to providing visible guides in the dark for guiding the application of written matter on said writing sheets.
Claim 3
Dependent Claim
16 words
A backing sheet substantially as set forth in claim 1 wherein said raised regions are luminescent.
Claim 4
Dependent Claim
16 words
A backing sheet substantially as set forth in claim 1 wherein said raised regions are non-luminescent.
Claim 5
Dependent Claim
18 words
A backing sheet as set forth in claim 1 wherein said raised regions are parallel straight line regions.
Claim 6
Dependent Claim
18 words
A backing sheet as set forth in claim 4 wherein said raised regions are equispaced straight line regions.
Claim 7
Dependent Claim
25 words
A backing sheet substantially as set forth in claim 1 wherein said raised regions are in the form of tape strips adhered to the sheet.
Claim 8
Dependent Claim
25 words
A backing sheet as set forth in claim 1 wherein said raised regions are on an overlay sheet associated in assembly with said backing sheet.
Claim 9
Dependent Claim
22 words
A backing sheet as set forth in claim 7 wherein said overlay sheet is of material which will pass luminescent light therethrough.
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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |