Patent US3503633A successfully refreshed from Google Patents.
US3503633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically insulating pipe coupling assembly,particularly for domestic branch extensions
Assignee: Individual
•
Filing: 1968-07-29
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Granted: 1970-03-31
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Expires: 1988-07-29
Abstract
No abstract record available.
Inventors
- 👤 Karlheinz Braun
- 👤 Werner Kipping
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:04
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/10; F16L13/11; F16L25/00; F16L25/02
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) | 1973-03-30 | 1973-09-29 | 1974-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-30 | 1977-09-29 | 1978-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-30 | 1981-09-29 | 1982-03-31 | $7700.00 | Window Closed / Lapsed |