US3537711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure differential seal
Assignee: Proctor Silex Inc
•
Filing: 1969-05-22
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Granted: 1970-11-03
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Expires: 1989-05-22
Abstract
No abstract record available.
Inventors
- 👤 Clifford R Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:48
CPC Classifications
F; F16; F16J; F16J15/00; A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; A47L5/36; A47L5/362; A47L9/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |