US3538208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making pen wicks of a synthetic resin
Assignee: Teikoku Hat Mfg Co Ltd
•
Filing: 1968-05-24
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Granted: 1970-11-03
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Expires: 1988-05-24
Abstract
No abstract record available.
Inventors
- 👤 Katsumi Ohtsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:42
CPC Classifications
B; B43; B43K; B43K1/00; B43K1/003; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/12; B29C48/25; B29C48/30; B29C48/32; B29C69/00; B29C48/001; B29C48/0018; B29C48/0022; B29L; B29L2023/00; B29L2023/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2220221A
Cited
US2287282A
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US2940126A
Cited
US3152202A
Cited
US3296661A
Cited
US3399262A
Cited
US3435107A
Cited
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 |