US3303337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminated writing instruments
Assignee: Individual
•
Filing: 1964-06-08
•
Granted: 1967-02-07
•
Expires: 1984-06-08
Abstract
No abstract record available.
Inventors
- 👤 Lo Kan Cheung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:28
CPC Classifications
B; B43; B43K; B43K29/00; B43K29/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1310257A
Cited
US1216862A
Cited
US1722238A
Cited
US2323960A
Cited
US2484154A
Cited
FR1040172A
Cited
GB805573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |