US3200787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sub-atmospheric pressure indicator
Assignee: Michigan Dynamics Inc
•
Filing: 1963-12-18
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Granted: 1965-08-17
•
Expires: 1983-12-18
Abstract
No abstract record available.
Inventors
- 👤 Rex C Darnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:31
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/38; H01H35/26; H01H35/2607; H01H35/2614; H01H35/2657; Y; Y10; Y10S; Y10S116/00; Y10S116/42; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A VACUUM INDICATING DEVICE INCLUDI NG A HOLLOW HOUSING, A PRESSURE RESPONSIVE MEMBER MOVABLY DISPOSED WITHIN SAID HOUSING AND FORMING THEREWITH A CLOSED PRESSURE CHAMBER ON ONE SIDE OF SAID PRESSURE RESPONSIVE MEMBER WITH THE OTHER SIDE THREOF EXPOSED TO ATMOSPHERIC PRESSURE, COMPRESSION SPRING MEANS HAVING ONE END OPERATIVELY ENGAGING SAID PRESSURE RESPONSIVE MEMBER AND NORMALLY BIASING SAID PRESSURE RESPONSIVE MEMBER IN ONE DIRECTION, SAID PRESSURE RESPONSIVE MEMBER BEING MOVABLE IN A DIRECTION COMPRESSING SAID SPRING MEANS WHEN A SUB-ATMOPHERIC PRESSURE EXISTS IN SAID CHAMBER, AN INDICATOR ELEMENT ON THE OTHER SIDE OF SAID PRESSURE RESPONSIVE MEMBER, MEANS NORMALLY BIASING SAID INDICATOR ELEMENT IN A DIRECTION AWAY FROM SAID PRESSURE RESPONSIVE MEMBER, MOVABLE LATCHING MEANS FOR SAID INDICATOR ELEMENT, SAID PRESSURE RESPONSIVE MEMBER OPERATIVELY ENGAGING AND BIASING SAID LATCHING MEANS INTO LOCKING ENGAGEMENT WITH SAID INDICATOR ELEMENT WHEN A FIRST PREDETERMINED PRESSURE EXISTS IN SAID PRES-
Claim 2
Dependent Claim
146 words
A VACUUM INDICATING DEVICE INCLUDI NG A HOLLOW HOUSING, A PRESSURE RESPONSIVE MEMBER MOVABLY DISPOSED WITHIN SAID HOUSING AND FORMING THEREWITH A CLOSED PRESSURE CHAMBER ON ONE SIDE OF SAID PRESSURE RESPONSIVE MEMBER WITH THE OTHER SIDE THREOF EXPOSED TO ATMOSPHERIC PRESSURE, COMPRESSION SPRING MEANS HAVING ONE END OPERATIVELY ENGAGING SAID PRESSURE RESPONSIVE MEMBER AND NORMALLY BIASING SAID PRESSURE RESPONSIVE MEMBER IN ONE DIRECTION, SAID PRESSURE RESPONSIVE MEMBER BEING MOVABLE IN A DIRECTION COMPRESSING SAID SPRING MEANS WHEN A SUB-ATMOPHERIC PRESSURE EXISTS IN SAID CHAMBER, AN INDICATOR ELEMENT ON THE OTHER SIDE OF SAID PRESSURE RESPONSIVE MEMBER, MEANS NORMALLY BIASING SAID INDICATOR ELEMENT IN A DIRECTION AWAY FROM SAID PRESSURE RESPONSIVE MEMBER, MOVABLE LATCHING MEANS FOR SAID INDICATOR ELEMENT, SAID PRESSURE RESPONSIVE MEMBER OPERATIVELY ENGAGING AND BIASING SAID LATCHING MEANS INTO LOCKING ENGAGEMENT WITH SAID INDICATOR ELEMENT WHEN A FIRST PREDETERMINED PRESSURE EXISTS IN SAID PRES-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |