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Patent US2959196A successfully refreshed from Google Patents.
US2959196A
Expired / Lapsed
US
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Multiple wall pipe
Assignee: DURA VENT CORP
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Filing: 1955-11-23
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Granted: 1960-11-08
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Expires: 1975-11-23
Abstract
No abstract record available.
Inventors
- 👤 Stanley E Truesdell
- 👤 Kerimly Nicolas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:31
CPC Classifications
F; F16; F16L; F16L37/00; F16L37/08; F16L37/084; F16L37/56; F16L37/565; F16L9/00; F16L9/18; F23; F23J; F23J13/00; F23J13/02; F23J13/025; F23J13/04; F23J2213/00; F23J2213/20; F23J2213/202; F23J2900/00; F23J2900/13023
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) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |