Patent US3320407A successfully refreshed from Google Patents.
Patent US3507520A successfully refreshed from Google Patents.
US3507520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling for connecting pipes particularly of synthetic material
Assignee: Georg Fischer AG
•
Filing: 1968-12-02
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Granted: 1970-04-21
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Expires: 1988-12-02
Abstract
No abstract record available.
Inventors
- 👤 Erich Guldener
- 👤 Rudolf Friedrich Hubscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:52
CPC Classifications
F; F16; F16L; F16L21/00; F16L37/00; F16L37/08; F16L37/12; F16L47/00; F16L47/14; Y; Y10; Y10T; Y10T403/00; Y10T403/57; Y10T403/5753; Y10T403/70; Y10T403/7047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US184599A
Cited
GB189312094A
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US1259833A
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US1578734A
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US2457105A
Cited
GB846357A
Cited
US3042430A
Cited
FR1207150A
Cited
US2998269A
Cited
US3201156A
Cited
FR1292343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |