Patent US4462616A successfully refreshed from Google Patents.
US4462616A
Expired / Lapsed
US
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Record material
Assignee: Wiggins Teape Group Ltd
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Filing: 1982-11-18
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Granted: 1984-07-31
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Expires: 2002-11-18
Abstract
Abstract Pressure- or heat-sensitive record material carries hydrated zirconia as a color developer material. The hydrated zirconia may be modified by the presence of compounds or ions of one or more multivalent metals.
Inventors
- 👤 Kenneth J. Shanton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:56
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; B41M5/1555; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/25; Y10T428/258
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
9 words
Record material carrying hydrated zirconia as a colour developer.
Claim 2
Dependent Claim
9 words
Record material carrying hydrated zirconia as a colour developer.
Claim 3
Dependent Claim
27 words
Record material as claimed in claim 1, characterized in that the hydrated zirconia is modified by the presence of a compound or ions of a multivalent metal.
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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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |