US2510941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of brittlizing pencil sheaths
Assignee: Joseph Dixon Crucible Co
•
Filing: 1949-04-22
•
Granted: 1950-06-13
•
Expires: 1969-04-22
Abstract
No abstract record available.
Inventors
- 👤 John E Ake
- 👤 Miller Kay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:28
CPC Classifications
B; B43; B43K; B43K19/00; B43K19/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
THE METHOD OF BRITTLIZING SHEATHS OF PENCILS HAVING A CONVOLUTE SHEATH OF PAPER, ADJACENT CONVOLUTIONS BEING SECURED BY ADHESIVE, SAID METHOD CONSISTING OF PREDRYING THE PENCILS IN A TEMPERATURE NOT EXCEEDING 250*F. AND THEREAFTER SUBJECTING THE PENCILS TO A BRITTILIZING TEMPERATURE RANGING BETWEEN APPROXIMATE TEMPERATURES OF 390*-400*F.
Claim 2
Independent Claim
47 words
THE METHOD OF BRITTLIZING SHEATHS OF PENCILS HAVING A CONVOLUTE SHEATH OF PAPER, ADJACENT CONVOLUTIONS BEING SECURED BY ADHESIVE, SAID METHOD CONSISTING OF PREDRYING THE PENCILS IN A TEMPERATURE NOT EXCEEDING 250*F. AND THEREAFTER SUBJECTING THE PENCILS TO A BRITTILIZING TEMPERATURE RANGING BETWEEN APPROXIMATE TEMPERATURES OF 390*-400*F.
References Cited (Backward Citations)
US1222152A
Cited
US2375616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-12 | 1953-12-12 | 1954-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-12 | 1957-12-12 | 1958-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-12 | 1961-12-12 | 1962-06-13 | $7700.00 | Window Closed / Lapsed |