Patent US2981439A successfully refreshed from Google Patents.
US2981439A
Expired / Lapsed
US
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Coupling for gas appliance
Assignee: Knapp Monarch Co
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Filing: 1957-04-02
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Granted: 1961-04-25
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Expires: 1977-04-02
Abstract
No abstract record available.
Inventors
- 👤 Russell I Huffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:06
CPC Classifications
F; F17; F17C; F17C13/00; F17C13/002; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0323; F17C2205/0388; F17C2205/0394; F17C2221/00; F17C2221/03; F17C2221/032; F17C2221/035; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE66751C
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US558364A
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US1324206A
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US937364A
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US1128948A
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US1007326A
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US1227563A
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US2779517A
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US2804994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |