Patent US2607145A successfully refreshed from Google Patents.
Patent US2937664A successfully refreshed from Google Patents.
US2937664A
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Self-supporting flexible ducting
Assignee: Individual
•
Filing: 1957-10-01
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Granted: 1960-05-24
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Expires: 1977-10-01
Abstract
No abstract record available.
Inventors
- 👤 Walter A Plummer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:06
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/17; Y; Y10; Y10S; Y10S138/00; Y10S138/10; Y10S174/00; Y10S174/11; Y10S24/00; Y10S24/30; Y10S24/38; Y10S24/39; Y10T; Y10T24/00; Y10T24/45; Y10T24/45152; Y10T24/45173
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190418955A
Cited
US837512A
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US1577050A
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US1863624A
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US2759522A
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US2782803A
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US2756172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |