Patent US3426409A successfully refreshed from Google Patents.
US3426409A
Expired / Lapsed
US
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Method of making a tubular walled chamber
Assignee: RTX Corp
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Filing: 1966-04-13
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Granted: 1969-02-11
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Expires: 1986-04-13
Abstract
No abstract record available.
Inventors
- 👤 George D Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:56
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; F; F05; F05B; F05B2260/00; F05B2260/96; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49346; Y10T29/4935; Y10T29/49393
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123907A
Cited
US877609A
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US891302A
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US1420241A
Cited
US3045340A
Cited
US3127737A
Cited
US3208132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |