US3431946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inflatable pipe plug
Assignee: Individual
•
Filing: 1965-11-19
•
Granted: 1969-03-11
•
Expires: 1985-11-19
Abstract
No abstract record available.
Inventors
- 👤 Willard A Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:55
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16L55/12; F16L55/128; F16L55/1283
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1221733A
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US2399544A
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US2601248A
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US2701960A
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US2894539A
Cited
US2929410A
Cited
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US3106735A
Cited
US3114395A
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US3183939A
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US3285290A
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US3153845A
Cited
US3298399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-10 | 1972-09-09 | 1973-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-10 | 1976-09-09 | 1977-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-10 | 1980-09-09 | 1981-03-11 | $7700.00 | Window Closed / Lapsed |