US3447243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ellipsograph
Assignee: ELLIPSOGRAPH SA
•
Filing: 1967-04-18
•
Granted: 1969-06-03
•
Expires: 1987-04-18
Abstract
No abstract record available.
Inventors
- 👤 Ismael Diaz-Esparza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:01
CPC Classifications
B; B43; B43L; B43L11/00; B43L11/02; B43L11/04; B43L11/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE280432C
Cited
US288770A
Cited
DE632674C
Cited
GB189617954A
Cited
US1872505A
Cited
US2607118A
Cited
DE892681C
Cited
US3197871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |