US3390967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbide hard alloys for use in writing instruments
Assignee: Deutsche Edelstahlwerke AG
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Filing: 1967-02-06
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Granted: 1968-07-02
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Expires: 1987-02-06
Abstract
No abstract record available.
Inventors
- 👤 Frehn Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:33
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0292; B; B43; B43K; B43K1/00; B43K1/06; C22C29/00; C22C29/02; C22C29/06; C22C29/067; C22C32/00; C22C32/0047; C22C32/0052
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2228235A
Cited
US2396058A
Cited
DE1039241B
Cited
US2752666A
Cited
US3303825A
Cited
US3053706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |