US1708571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectifying element
Assignee: Unifrax I LLC
•
Filing: 1925-02-21
•
Granted: 1929-04-09
•
Expires: 1945-02-21
Abstract
No abstract record available.
Inventors
- 👤 Miner L Hartmann
- 👤 Morrow C Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:18
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/80; H10D62/83; H10D62/832; H10D62/8325; Y; Y10; Y10S; Y10S438/00; Y10S438/931
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) | 1932-04-08 | 1932-10-08 | 1933-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-04-08 | 1936-10-08 | 1937-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-04-08 | 1940-10-08 | 1941-04-09 | $7700.00 | Window Closed / Lapsed |