US3221991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic thermostat and system controlled thereby
Assignee: Robertshaw Controls Co
•
Filing: 1962-04-26
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Granted: 1965-12-07
•
Expires: 1982-04-26
Abstract
No abstract record available.
Inventors
- 👤 Roy W Houser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:53
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN COMBINATION: A STATIONARY TUBE CONNECTABLE TO A SOURCE OF VACUUM; A VACUUM CHAMBER SURROUNDING AN END OF SAID TUBE AND BEING CONNECTIBLE TO A SLAVE MEMBER; A FLEXIBLE DIAPHRAGM ACROSS SAID VACUUM CHAMBER AND HAVING ONE DIAPHRAGM SIDE COVERING AND UNCOVERING SAID END OF SAID TUBE BY THE FLEXING OF SAID DIAPHRAGM; AN ATMOSPHERIC BLEED HOLE IN SAID DIAPHRAGM OFFSET FROM THE END OF SAID TUBE; A COVER PLATE HAVING AN OPENING SURROUNDING THE END OF SAID TUBE, SAID PLATE COVERING SAID UNCOVERING SAID BLEED HOLE; BIASING MEANS YIELDINGLY BIASING SAID COVER PLATE TOWARD SAD DIAPHRAGM; AND THRUST MEANS ON THE OPPOSITE DIAPHRAGM SIDE MOVABLE TO OPEN THE END OF SAID TUBE WHILE CLOSING SAID BLEED HOLE AND CLOSING THE END OF SAID TUBE WHILE OPENING SAID BLEED HOLE.
Claim 2
Dependent Claim
130 words
IN COMBINATION: A STATIONARY TUBE CONNECTABLE TO A SOURCE OF VACUUM; A VACUUM CHAMBER SURROUNDING AN END OF SAID TUBE AND BEING CONNECTIBLE TO A SLAVE MEMBER; A FLEXIBLE DIAPHRAGM ACROSS SAID VACUUM CHAMBER AND HAVING ONE DIAPHRAGM SIDE COVERING AND UNCOVERING SAID END OF SAID TUBE BY THE FLEXING OF SAID DIAPHRAGM; AN ATMOSPHERIC BLEED HOLE IN SAID DIAPHRAGM OFFSET FROM THE END OF SAID TUBE; A COVER PLATE HAVING AN OPENING SURROUNDING THE END OF SAID TUBE, SAID PLATE COVERING SAID UNCOVERING SAID BLEED HOLE; BIASING MEANS YIELDINGLY BIASING SAID COVER PLATE TOWARD SAD DIAPHRAGM; AND THRUST MEANS ON THE OPPOSITE DIAPHRAGM SIDE MOVABLE TO OPEN THE END OF SAID TUBE WHILE CLOSING SAID BLEED HOLE AND CLOSING THE END OF SAID TUBE WHILE OPENING SAID BLEED HOLE.
References Cited (Backward Citations)
GB268812A
Cited
US618260A
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US3125111A
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GB190123139A
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US1405181A
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FR507266A
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US1743142A
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US2197276A
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US2370582A
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US2868459A
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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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |