US3811983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing retroreflective sheeting
Assignee: Rowland Development Corp
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Filing: 1972-06-23
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Granted: 1974-05-21
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Expires: 1992-06-23
Abstract
Abstract RETROREFLECTIVE SHEETING IS PRODUCED BY BONDING A MULTIPLICITY OF CUBE CORNER FORMATIONS TO SHEET MATERIAL. CUBE CORNER FORMATIONS ARE PRODUCED ON A MOLD HAVING A SURFACE IN WHICH IS FORMED AN ARRAY OF MINUTE, CONTIGUOUS CUBE CORNER RECESSES. SHRINKAGE OF THE RESIN FORMULATION INITIALLY DEPOSITED IN THE RECESSES CAUSES DEPRESSIONS IN THE BASE PORTIONS OF THE CUBE CORNER FORMATIONS; THE DEPRESSIONS ARE FILLED WITH A BONDING MATERIAL WHICH SERVES NOT ONLY TO LEVEL THE CUBE CORNER FORMATIONS, BUT ALSO TO BOND THEM TO THE SHEET MATERIAL. THE APPARATUS UTILIZED IS A CONTINUOUSLY MOVING MOLD SURFACE AND HAS A PLURAITY OF STATIONS FOR EFFECTING THE SEVERAL STEPS OF THE PROCESS.
Inventors
- 👤 W Rowland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:58
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/12; G02B5/122; G02B5/124; B; B29; B29C; B29C53/00; B29C53/22; B29C53/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |