Patent US5169915A successfully refreshed from Google Patents.
US2965397A
Expired / Lapsed
US
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Self-locking duct take-off
Assignee: HENDRICKS SUPPLY Co Inc
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Filing: 1957-11-14
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Granted: 1960-12-20
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Expires: 1977-11-14
Abstract
No abstract record available.
Inventors
- 👤 Berg Roy Vanden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:56
CPC Classifications
F; F16; F16L; F16L41/00; F16L41/02; F16L41/025; F16L9/00; F16L9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1605872A
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US1871453A
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US1949055A
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US2227587A
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US2275572A
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US2246722A
Cited
US2585887A
Cited
US2880017A
Cited
US2799518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |