US3001887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper manufacture
Assignee: Mead Corp
•
Filing: 1957-09-20
•
Granted: 1961-09-26
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Expires: 1977-09-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Carl E Ahlm
- 👤 Jr Earl B Brookbank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:36
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/20; B42D25/29; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24835
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
A PROCESS FOR AUTHENTICATING A PAPER ARTICLE COMPRISING THE STEPS OF PRINTING AN AUTHENTICATING DESIGN ON THE SURFACE OF SAID ARTICLE WITH A COLLOIDAL SILICA CONTAINING ABOUT 10 TO 30% COLLOIDAL SILICA AS SIO2 AND HAVING THE SILICA PARTICLES THEREOF PROVIDED WITH AN AVERAGE DIAMETER OF ABOUT 0.015 TO 0.1 MICRON, AND APPLYING A COLORLESS ORGANIC REACTANT IN SOLUTION TO SAID SURFACE OF SAID ARTICLE TO COLOR SAID PARTICLES AND THUS MAKE SAID DESIGN READILY VISIBLE FOR AUTHENTICATION PURPOSES, SAID COLORLESS ORGANIC REACTANT BEING SELECTED FROM THE GROUP CONSISTING OF MICHLER''S HYDROL, LACTONE OF MALACHITE GREEN LEUCO OF MALACHITE GREEN, LACTONE OF CRYSTAL VIOLET, AND LACTONE OF RHODAMINE B.
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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) | 1964-09-25 | 1965-03-27 | 1965-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-25 | 1969-03-27 | 1969-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-25 | 1973-03-27 | 1973-09-26 | $7700.00 | Window Closed / Lapsed |