US3520331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-sealing pipe coupling
Assignee: FPT Industries Ltd
•
Filing: 1967-12-04
•
Granted: 1970-07-14
•
Expires: 1987-12-04
Abstract
No abstract record available.
Inventors
- 👤 Walter Frederick Locke
- 👤 Ernest Arthur Watson
- 👤 Leonard Leslie Tyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:48
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16L55/1007; F16L37/00; F16L37/22; F16L37/23; F16L37/28; F16L37/30; F16L37/32; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87917; Y10T137/87925; Y10T137/87941; Y10T137/87949; Y10T137/87957
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2599935A
Cited
US2690918A
Cited
US2860893A
Cited
US2926934A
Cited
US2898130A
Cited
US3281757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |