US1521952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon attachment for typewriting machines
Assignee: CHAMPION CONSERVER Co
•
Filing: 1923-11-08
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Granted: 1925-01-06
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Expires: 1943-11-08
Abstract
No abstract record available.
Inventors
- 👤 Harold R Holmyard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:04
CPC Classifications
B; B41; B41J; B41J17/00; C; C25; C25D; C25D17/00; C25D17/06; C25D17/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1928-01-06 | 1928-07-07 | 1929-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-01-06 | 1932-07-07 | 1933-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-01-06 | 1936-07-07 | 1937-01-06 | $7700.00 | Window Closed / Lapsed |