Patent US2551867A successfully refreshed from Google Patents.
US2551867A
Expired / Lapsed
US
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Concentric pipe insulator and spacer
Assignee: Texaco Inc
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Filing: 1947-09-13
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Granted: 1951-05-08
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Expires: 1967-09-13
Abstract
No abstract record available.
Inventors
- 👤 Donald H Bond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:53
CPC Classifications
F; F16; F16L; F16L7/00; Y; Y10; Y10T; Y10T24/00; Y10T24/44; Y10T24/44291; Y10T24/44299; Y10T24/44308
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US225861A
Cited
US1940780A
Cited
FR47617E
Cited
FR834165A
Cited
US2153787A
Cited
GB538119A
Cited
US2444206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |