Patent US3564741A successfully refreshed from Google Patents.
US3564741A
Expired / Lapsed
US
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Perpetual calendars
Assignee: SVENSK TRAFINESS AB
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Filing: 1968-08-23
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Granted: 1971-02-23
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Expires: 1988-08-23
Abstract
Abstract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
Inventors
- 👤 Stig Harry Kahre
- 👤 Karl Olov Harald Lowemo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:44
CPC Classifications
G; G09; G09D; G09D3/00; G09D3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |