Patent US3477745A successfully refreshed from Google Patents.
US3477745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick connection of pipe to ducting
Assignee: PERMANENT PIPE PRODUCTS CO
•
Filing: 1968-03-11
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Granted: 1969-11-11
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Expires: 1988-03-11
Abstract
No abstract record available.
Inventors
- 👤 James W Williams
- 👤 Phillip K Proctor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:32
CPC Classifications
F; F16; F16L; F16L15/00; F16L15/006; F16L15/008; F16L41/00; F16L41/08; F16L41/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49833; Y10T29/49838; Y10T403/00; Y10T403/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1648855A
Cited
GB408608A
Cited
US2201930A
Cited
US2346051A
Cited
US2461863A
Cited
DE956108C
Cited
US3151893A
Cited
US3152817A
Cited
FR1398926A
Cited
FR1402079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |