Patent US2539783A successfully refreshed from Google Patents.
US2539783A
Expired / Lapsed
US
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Ring pipe hanger
Assignee: AMERICAN TUBE PRODUCTS Inc
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Filing: 1948-05-11
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Granted: 1951-01-30
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Expires: 1968-05-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Chester H Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:33
CPC Classifications
F; F16; F16L; F16L3/00; F16L3/08; F16L3/10; F16L3/11; F16L3/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US802087A
Cited
US978912A
Cited
US1025243A
Cited
US1819754A
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US1801171A
Cited
US2224145A
Cited
US2399103A
Cited
US2444701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |