US3137237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump sealing apparatus
Assignee: AR Wilfley and Sons Inc
•
Filing: 1961-08-22
•
Granted: 1964-06-16
•
Expires: 1981-08-22
Abstract
No abstract record available.
Inventors
- 👤 Irvin F Zagar
- 👤 George M Wilfley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:26
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/14; F04D29/146; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/36; Y; Y10; Y10S; Y10S277/00; Y10S277/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
PUMP SEALING APPARATUS COMPRISING A PUMP HAVING A ROTATABLE MEANS INCLUDING AN IMPELLER, EXHAUST MEANS IN COMMUNICATION WITH ATMOSPHERE, AND SEALING MEANS FOR PREVENTING LIQUID FLOW BETWEEN SAID IMPELLER AND SAID EXHAUST MEANS, SAID SEALING MEANS INCLUDING A FLEXIBLE MOVABLE INTERMEDIATE PORTION, MEANS NORMALLY RETAINING SAID SEALING MEANS IN OPERATIVE SEALING POSITION WITH SAID INTERMEDIATE PORTION IN ENGAGEMENT WITH A PART OF SAID ROTATABLE MEANS, AND SAID PUMP INCLUDING MEANS FOR REDUCING PRESSURE ON THE IMPELLER SIDE OF THE SEALING MEANS BELOW THE PRESSURE ON THE OTHER SIDE OF THE SEALING MEANS TO MOVE SAID SEALING MEANS COMPLETELY OUT OF ENGAGEMENT WITH SAID ROTATABLE MEANS.
Claim 2
Dependent Claim
105 words
PUMP SEALING APPARATUS COMPRISING A PUMP HAVING A ROTATABLE MEANS INCLUDING AN IMPELLER, EXHAUST MEANS IN COMMUNICATION WITH ATMOSPHERE, AND SEALING MEANS FOR PREVENTING LIQUID FLOW BETWEEN SAID IMPELLER AND SAID EXHAUST MEANS, SAID SEALING MEANS INCLUDING A FLEXIBLE MOVABLE INTERMEDIATE PORTION, MEANS NORMALLY RETAINING SAID SEALING MEANS IN OPERATIVE SEALING POSITION WITH SAID INTERMEDIATE PORTION IN ENGAGEMENT WITH A PART OF SAID ROTATABLE MEANS, AND SAID PUMP INCLUDING MEANS FOR REDUCING PRESSURE ON THE IMPELLER SIDE OF THE SEALING MEANS BELOW THE PRESSURE ON THE OTHER SIDE OF THE SEALING MEANS TO MOVE SAID SEALING MEANS COMPLETELY OUT OF ENGAGEMENT WITH SAID ROTATABLE MEANS.
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) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |