US2812900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan guard
Assignee: WM H Welsh Co Inc
•
Filing: 1954-11-16
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Granted: 1957-11-12
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Expires: 1974-11-16
Abstract
No abstract record available.
Inventors
- 👤 Charles L Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:27
CPC Classifications
F; F16; F16P; F16P1/00; F16P1/02; F04; F04D; F04D29/00; F04D29/70; F04D29/701; F04D29/703
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1219790A
Cited
US1633988A
Cited
US1751793A
Cited
US2036478A
Cited
US1997738A
Cited
US2188488A
Cited
US2763428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |