Patent US2425557A successfully refreshed from Google Patents.
Patent US1639670A successfully refreshed from Google Patents.
US1639670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air vent for transmission units
Assignee: HURON IND Inc
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Filing: 1925-12-17
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Granted: 1927-08-23
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Expires: 1945-12-17
Abstract
No abstract record available.
Inventors
- 👤 Gustaf W Rydner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:32
CPC Classifications
F; F16; F16K; F16K24/00; F16K24/04; F16H; F16H57/00; F16H57/02; F16H57/027
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) | 1930-08-22 | 1931-02-21 | 1931-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-08-22 | 1935-02-21 | 1935-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-08-22 | 1939-02-21 | 1939-08-23 | $7700.00 | Window Closed / Lapsed |