Patent US3537801A successfully refreshed from Google Patents.
US3537801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball point for writing instruments
Assignee: Individual
•
Filing: 1968-03-22
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Granted: 1970-11-03
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Expires: 1988-03-22
Abstract
No abstract record available.
Inventors
- 👤 Francisco Barcelloni Corte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:15
CPC Classifications
B; B43; B43K; B43K7/00; B43K7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |