US3521910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube coupling
Assignee: Cajon Co
•
Filing: 1968-11-12
•
Granted: 1970-07-28
•
Expires: 1988-11-12
Abstract
No abstract record available.
Inventors
- 👤 Francis J Callahan Jr
- 👤 Erling G Wennerstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:33
CPC Classifications
F; F16; F16L; F16L19/00; F16L19/02; F16L19/0212; F16L19/0218
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1834581A
Cited
US2255634A
Cited
US2528665A
Cited
FR1059317A
Cited
US3098662A
Cited
US3208758A
Cited
US3428337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |