US2803219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable refill extension
Assignee: Dur-O-Lite Pencil Co
•
Filing: 1955-04-15
•
Granted: 1957-08-20
•
Expires: 1975-04-15
Abstract
No abstract record available.
Inventors
- 👤 Frank J Stoeberl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:11
CPC Classifications
B; B43; B43K; B43K24/00; B43K24/02; B43K7/00; B43K7/12; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32426; Y10T403/32442; Y10T403/32451
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1310469A
Cited
FR962297A
Cited
US1240582A
Cited
US2443249A
Cited
US2427068A
Cited
FR58050E
Cited
FR976412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |