US730456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silent-key mechanism for type-writers.
Assignee: Underwood Typewriter Co
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Filing: 1902-11-13
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Granted: 1903-06-09
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Expires: 1922-11-13
Abstract
No abstract record available.
Inventors
- 👤 William F Helmond
- 👤 Oscar C Kavle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:15
CPC Classifications
B; B41; B41J; B41J25/00; B41J25/20
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) | 1906-06-08 | 1906-12-08 | 1907-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1910-06-08 | 1910-12-08 | 1911-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1914-06-08 | 1914-12-08 | 1915-06-09 | $7700.00 | Window Closed / Lapsed |