US3131638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leak detecting device
Assignee: Lapp Insulator Co LLC
•
Filing: 1962-07-05
•
Granted: 1964-05-05
•
Expires: 1982-07-05
Abstract
No abstract record available.
Inventors
- 👤 Lawrence F Wilson
- 👤 Leipold Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:00
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/0009; F04B43/0081; F04B43/009
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN A FLUID-OPERATING APPARATUS OF THE TYPE COMPRISING TWO PLATES DEFINING A CHAMBER, A DIAPHRAGM ASSEMBLY STRETCHED ACROSS SAID CHAMBER AND GRIPPED AT ITS PERIPHERY BETWEEN SAID PLATES TO DIVIDE SAID CHAMBER INTO TWO SUBCHAMBERS, MEANS FOR THE INTAKE AND DISCHARGE OF A FIRST FLUID INTO AND FROM ONE OF SAID SUB-CHAMBERS, MEANS FOR THE INTAKE AND DISCHARGE OF A SECOND FLUID INTO AND FROM THE OTHER SUB-CHAMBER, SAID DIAPHRAGM ASSEMBLY COMPRISING A LAMINATION OF AT LEAST THREE DIAPHRAGM MEMBERS INCLUDING A CENTRAL AND TWO IMPERFORATE SIDE MEMBERS, AND LEAK-INDICATING MEANS CONNECTED TO SAID DIAPHRAGM ASSEMBLY WHEREIN, (A) EACH OF SAID DIAPHRAGM MEMBERS HAD A PORTION THEREOF EXTENDING OUTWARDLY BEYOND SAID PLATES, SAID PORTIONS LYING IN SUPERIMPOSED RELATIONSHIP,
Claim 2
Dependent Claim
118 words
IN A FLUID-OPERATING APPARATUS OF THE TYPE COMPRISING TWO PLATES DEFINING A CHAMBER, A DIAPHRAGM ASSEMBLY STRETCHED ACROSS SAID CHAMBER AND GRIPPED AT ITS PERIPHERY BETWEEN SAID PLATES TO DIVIDE SAID CHAMBER INTO TWO SUBCHAMBERS, MEANS FOR THE INTAKE AND DISCHARGE OF A FIRST FLUID INTO AND FROM ONE OF SAID SUB-CHAMBERS, MEANS FOR THE INTAKE AND DISCHARGE OF A SECOND FLUID INTO AND FROM THE OTHER SUB-CHAMBER, SAID DIAPHRAGM ASSEMBLY COMPRISING A LAMINATION OF AT LEAST THREE DIAPHRAGM MEMBERS INCLUDING A CENTRAL AND TWO IMPERFORATE SIDE MEMBERS, AND LEAK-INDICATING MEANS CONNECTED TO SAID DIAPHRAGM ASSEMBLY WHEREIN, (A) EACH OF SAID DIAPHRAGM MEMBERS HAD A PORTION THEREOF EXTENDING OUTWARDLY BEYOND SAID PLATES, SAID PORTIONS LYING IN SUPERIMPOSED RELATIONSHIP,
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |