Patent US3204568A successfully refreshed from Google Patents.
US3204568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragms
Assignee: National Research Development Corp UK
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Filing: 1962-11-05
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Granted: 1965-09-07
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Expires: 1982-11-05
Abstract
No abstract record available.
Inventors
- 👤 Grossfield Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:42
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/02; F02; F02M; F02M1/00; F04; F04B; F04B43/00; F04B43/02; F04B43/06; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/438; F02M2700/4388; F02M2700/439
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A DIAPHRAGM-OPERATED MACHINE COMPRISING WALL MEANS DEFINING A PRESSURE CHAMBER; WALL MEANS DEFINING A PUMPING CHAMBER; AND A FLEXIBLE DIAPHRAGM SEPARATING SAID TWO CHAMBERS, SAID DIAPHRAGM CONFORMING WHEN RELAXED TO THE SHAPE OF SAID PUMPING CHAMBER AND COMPRISING A SHEET OF FLEXIBLE MATERIAL, ONE OF THE SURFACES
Claim 2
Dependent Claim
47 words
A DIAPHRAGM-OPERATED MACHINE COMPRISING WALL MEANS DEFINING A PRESSURE CHAMBER; WALL MEANS DEFINING A PUMPING CHAMBER; AND A FLEXIBLE DIAPHRAGM SEPARATING SAID TWO CHAMBERS, SAID DIAPHRAGM CONFORMING WHEN RELAXED TO THE SHAPE OF SAID PUMPING CHAMBER AND COMPRISING A SHEET OF FLEXIBLE MATERIAL, ONE OF THE SURFACES
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |