Patent US2085486A successfully refreshed from Google Patents.
Patent US2670601A successfully refreshed from Google Patents.
US2670601A
Expired / Lapsed
US
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Spacing means for wall sections of flame tubes
Assignee: AV Roe Canada Ltd
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Filing: 1950-10-17
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Granted: 1954-03-02
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Expires: 1970-10-17
Abstract
No abstract record available.
Inventors
- 👤 Frederick D M Williams
- 👤 Donald E Morrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:32
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/04; F23R3/06; F23R3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |