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Patent US2609688A successfully refreshed from Google Patents.
US2609688A
Expired / Lapsed
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Humidity sensitive device
Assignee: RCA Corp
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Filing: 1949-11-30
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Granted: 1952-09-09
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Expires: 1969-11-30
Abstract
No abstract record available.
Inventors
- 👤 Larach Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:21
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
IN A HUMIDITY-INDICATING APPARATUS OF THE TYPE COMPRISING A BODY OF ELECTRICALLY INSULATING MATERIAL HAVING ON A SURFACE THEREOF A FILM OF A MATERIAL OF WHICH THE ELECTRICAL CONDUCTIVITY VARIES WITH THE HUMIDITY, A PAIR OF ELECTRODES IN CONTACT WITH SAID FILM, MEANS FOR APPLYING A D.C. POTENTIAL ACROSS SAID FILM, AND
Claim 2
Dependent Claim
52 words
IN A HUMIDITY-INDICATING APPARATUS OF THE TYPE COMPRISING A BODY OF ELECTRICALLY INSULATING MATERIAL HAVING ON A SURFACE THEREOF A FILM OF A MATERIAL OF WHICH THE ELECTRICAL CONDUCTIVITY VARIES WITH THE HUMIDITY, A PAIR OF ELECTRODES IN CONTACT WITH SAID FILM, MEANS FOR APPLYING A D.C. POTENTIAL ACROSS SAID FILM, AND
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) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |