US3406987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split-sleeve sheet metal pipe coupling
Assignee: 3M Co
•
Filing: 1965-04-26
•
Granted: 1968-10-22
•
Expires: 1985-04-26
Abstract
No abstract record available.
Inventors
- 👤 David N Hunder
- 👤 Richard G Eikos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:33
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/10; F16L13/11; F16L21/00; F16L21/06; F16L41/00; F16L41/02; F16L41/04; F16L41/06; F16L55/00; F16L55/16; F16L55/168; F16L55/17; F16L55/171; Y; Y10; Y10T; Y10T403/00; Y10T403/16; Y10T403/57; Y10T403/5761; Y10T403/5766; Y10T403/5773
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US396177A
Cited
US494147A
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GB190018666A
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US875729A
Cited
US873689A
Cited
US978346A
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US924262A
Cited
US2128720A
Cited
US2567639A
Cited
US2959196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |