US2825702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating elements in film form
Assignee: ELECTROFILM Inc
•
Filing: 1953-09-03
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Granted: 1958-03-04
•
Expires: 1973-09-03
Abstract
No abstract record available.
Inventors
- 👤 Herman I Silversher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:15
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/26; C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; C08L; C08L63/00; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B3/00; H01B3/18; H01B3/30; H01B3/38; H01B3/42; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06573; H01C17/06586
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A HEATING ELEMENT COMPOSITION COMPRISING A MIXTURE OF FINELY DIVIDED ELECTRICALLY CONDUCTIVE METAL PARTICLES AND ALSO GRAPHITE PARTICLES AND A HEAT SETTING RESINOUS BINDER CONSISTING ESSENTIALLY OF A FORMALDEHYDE RESIN OF THE CLASS CONSISTING OF UREA FORMALDEHYDE AND MELAMINE FORMALDEHYDE RESINS TOGETHER WITH A COMPLEX EPOXIDE WHICH IS A POLYETHER DERIVATIVE OF POLYHYDRIC PHENOL CONTAINING EPOXIDE GROUPS AND FREE FROM FUNCTIONAL GROUPS OTHER THAN EPOXIDE AND HYDROXYL GROUPS, SAID COMPOSITION CONTAINING SAID METAL, TOTAL RESINS AND GRAPHITE IN THE WEIGHT PROPORTION OF ABOUT 3 TO 80 PARTS METAL PARTICLES, 20 TO 50 PARTS (SOLIDS BASIS) OF RESIN (THE RESIN ITSELF BEING COMPOSED OF FROM ABOUT 5 TO 9 PARTS OF SAID EPOXIDE TO FROM ABOUT 2 TO 5 PARTS OF SAID FORMALDEHYDE RESIN), AND 3 TO 65 PARTS OF GRAPHITE.
Claim 2
Dependent Claim
130 words
A HEATING ELEMENT COMPOSITION COMPRISING A MIXTURE OF FINELY DIVIDED ELECTRICALLY CONDUCTIVE METAL PARTICLES AND ALSO GRAPHITE PARTICLES AND A HEAT SETTING RESINOUS BINDER CONSISTING ESSENTIALLY OF A FORMALDEHYDE RESIN OF THE CLASS CONSISTING OF UREA FORMALDEHYDE AND MELAMINE FORMALDEHYDE RESINS TOGETHER WITH A COMPLEX EPOXIDE WHICH IS A POLYETHER DERIVATIVE OF POLYHYDRIC PHENOL CONTAINING EPOXIDE GROUPS AND FREE FROM FUNCTIONAL GROUPS OTHER THAN EPOXIDE AND HYDROXYL GROUPS, SAID COMPOSITION CONTAINING SAID METAL, TOTAL RESINS AND GRAPHITE IN THE WEIGHT PROPORTION OF ABOUT 3 TO 80 PARTS METAL PARTICLES, 20 TO 50 PARTS (SOLIDS BASIS) OF RESIN (THE RESIN ITSELF BEING COMPOSED OF FROM ABOUT 5 TO 9 PARTS OF SAID EPOXIDE TO FROM ABOUT 2 TO 5 PARTS OF SAID FORMALDEHYDE RESIN), AND 3 TO 65 PARTS OF GRAPHITE.
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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) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |