Patent US4381748A successfully refreshed from Google Patents.
Patent US1934263A successfully refreshed from Google Patents.
US1934263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory
Assignee: Individual
•
Filing: 1933-05-25
•
Granted: 1933-11-07
•
Expires: 1953-05-25
Abstract
No abstract record available.
Inventors
- 👤 Hacks Karl
- 👤 William S Sprow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:51
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/16; F27D1/1636; F27D1/1642; F27D1/1647; C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/65; C04B35/651; F27B; F27B3/00; F27B3/10; F27B3/12; F27B2003/125; F27D2001/1605; F27D2001/161
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) | 1936-11-06 | 1937-05-08 | 1937-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-11-06 | 1941-05-08 | 1941-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-11-06 | 1945-05-08 | 1945-11-07 | $7700.00 | Window Closed / Lapsed |