US2728831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric hygrometer
Assignee: Phys-Chemical Res Corp
•
Filing: 1951-11-09
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Granted: 1955-12-27
•
Expires: 1971-11-09
Abstract
No abstract record available.
Inventors
- 👤 Pope Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:24
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A HUMIDITY SENSITIVE ELEMENT COMPRISING A BODY MEMBER FORMED OF A SOLID, ELECTRICALLY INSULATING CROSSLINKED ORGANIC POLYMER, SAID BODY MEMBER HAVING AN ION EXCHANGE MATERIAL ONLY IN A THIN LAYER AT THE SURFACE OF
Claim 2
Dependent Claim
34 words
A HUMIDITY SENSITIVE ELEMENT COMPRISING A BODY MEMBER FORMED OF A SOLID, ELECTRICALLY INSULATING CROSSLINKED ORGANIC POLYMER, SAID BODY MEMBER HAVING AN ION EXCHANGE MATERIAL ONLY IN A THIN LAYER AT THE SURFACE OF
References Cited (Backward Citations)
US2424735A
Cited
US2295570A
Cited
US2285421A
Cited
US2400720A
Cited
US2435895A
Cited
US2377426A
Cited
US2466675A
Cited
US2446536A
Cited
GB645946A
Cited
US2500149A
Cited
US2613302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |