Patent US3326217A successfully refreshed from Google Patents.
US2740896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of using heat sensitive copying paper
Assignee: 3M Co
•
Filing: 1947-05-10
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Granted: 1956-04-03
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Expires: 1967-05-10
Abstract
No abstract record available.
Inventors
- 👤 Carl S Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:59
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/30; G03B27/306; Y; Y10; Y10S; Y10S101/00; Y10S101/29
Claims Analysis
Total Claims: 0
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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) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |