Patent US2650112A successfully refreshed from Google Patents.
US2650112A
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Double walled pipe and coupling therefor
Assignee: WILLIAMS WALLACE Co
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Filing: 1949-02-02
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Granted: 1953-08-25
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Expires: 1969-02-02
Abstract
No abstract record available.
Inventors
- 👤 Kinkead Alan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:06
CPC Classifications
F; F23; F23J; F23J13/00; F23J13/02; F23J13/025; E; E04; E04F; E04F17/00; F16; F16L; F16L39/00; F16L39/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1085303A
Cited
US1122392A
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US1141492A
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US1451043A
Cited
US2048457A
Cited
US2013193A
Cited
FR840472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |