US3520542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double wedge seal
Assignee: Pneumo Dynamics Corp
•
Filing: 1966-02-16
•
Granted: 1970-07-14
•
Expires: 1986-02-16
Abstract
No abstract record available.
Inventors
- 👤 Waldo Gerhard Fruehauf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:21
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3232; F16J15/3236
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1901606A
Cited
GB451812A
Cited
US2326489A
Cited
US2701155A
Cited
US2819917A
Cited
FR1286520A
Cited
US3264885A
Cited
US3326560A
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 |