Patent US3375838A successfully refreshed from Google Patents.
US3375838A
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Vacuum modulator
Assignee: Motors Liquidation Co
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Filing: 1965-10-13
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Granted: 1968-04-02
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Expires: 1985-10-13
Abstract
No abstract record available.
Inventors
- 👤 Forrest R Cheek
- 👤 Robert W Stapleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:26
CPC Classifications
F; F15; F15C; F15C4/00; F16; F16H; F16H59/00; F16H59/14; F16H59/26; F16H59/30; Y; Y10; Y10T; Y10T137/00; Y10T137/1842; Y10T137/1939; Y10T137/2012
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A VACUUM MODULATOR COMPRISING A MOVABLE MEMBER, MEANS FORMING AN EVACUATED CHAMBER, SAID MEANS HAVING A FIRST PORTION FIXED AGAINST MOVEMENT AND A SECOND MOVABLE PORTION OPERABLY CONNECTED TO SAID MOVABLE MEMBER, MEANS FORMING A SECOND CHAMBER ADAPTED TO BE CONNECTED TO A SOURCE OF VARIABLE VACUUM, PASSAGE MEANS BETWEEN SAID CHAMBERS, MEANS NORMALLY EFFECTIVE TO BLOCK OFF SAID PASSAGE TO BLOCK COMMUNICATION BETWEEN SAID CHAMBERS, SAID BLOCKING MEANS BEING MOVABLE UPON
Claim 2
Dependent Claim
72 words
A VACUUM MODULATOR COMPRISING A MOVABLE MEMBER, MEANS FORMING AN EVACUATED CHAMBER, SAID MEANS HAVING A FIRST PORTION FIXED AGAINST MOVEMENT AND A SECOND MOVABLE PORTION OPERABLY CONNECTED TO SAID MOVABLE MEMBER, MEANS FORMING A SECOND CHAMBER ADAPTED TO BE CONNECTED TO A SOURCE OF VARIABLE VACUUM, PASSAGE MEANS BETWEEN SAID CHAMBERS, MEANS NORMALLY EFFECTIVE TO BLOCK OFF SAID PASSAGE TO BLOCK COMMUNICATION BETWEEN SAID CHAMBERS, SAID BLOCKING MEANS BEING MOVABLE UPON
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) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |