US2833481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of breaking compressed acetylene black
Assignee: Shawinigan Chemicals Ltd
•
Filing: 1955-09-15
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Granted: 1958-05-06
•
Expires: 1975-09-15
Abstract
No abstract record available.
Inventors
- 👤 Robert L Perks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:05
CPC Classifications
B; B02; B02C; B02C19/00; B02C19/0056; B02C4/00; B02C4/28; B02C4/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE266329C
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US179612A
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US342811A
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US909133A
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US1143135A
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US1156373A
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US1327254A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |