Patent US1002721A successfully refreshed from Google Patents.
US1002721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric-arc furnace-heater.
Assignee: Hub Machine Welding & Contracting Co
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Filing: 1910-08-09
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Granted: 1911-09-05
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Expires: 1930-08-09
Abstract
No abstract record available.
Inventors
- 👤 Ezra A Mathers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:09
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H05H1/26; H05H1/32; H05H1/34; H05H1/38
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) | 1914-09-04 | 1915-03-06 | 1915-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1918-09-04 | 1919-03-06 | 1919-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1922-09-04 | 1923-03-06 | 1923-09-05 | $7700.00 | Window Closed / Lapsed |