US3311546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of thin film resistors
Assignee: AT&T Inc
•
Filing: 1963-12-12
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Granted: 1967-03-28
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Expires: 1983-12-12
Abstract
No abstract record available.
Inventors
- 👤 Robert W Berry
- 👤 David A Mclean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:26
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/075; H01C17/14; H01C17/16; C; C25; C25D; C25D11/00; C25D11/02; H01B; H01B1/00; H01C7/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087; Y10T29/49099
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD FOR THE FABRICATION OF A METAL FILM RESISTOR HAVING A SHORT RESISTIVE PATH LENGTH WHICH COMPRISES THE STEPS OF DEPOSITING UPON A NON-CONDUCTIVE SUBSTRATE (A) A FIRST ANODIZABLE FILM-FORMING METAL OVER A REGION ENCOMPASSING AND LARGER THAN THE DESIRED RESISTIVE PATH, (B) A SECOND ANODIZABLE FILM-FORMING METAL IN INTIMATE CONTACT WITH SAID FIRST ANODIZABLE FILM-FORMING METAL OVER TWO DISCRETE REGIONS OF SUCH CONFIGURATION THAT THE SPACING BETWEEN SAID DISCRETE REGIONS EQUALS IN LENGTH THE DESIRED RESISTIVE PATH, AND PHOTOENGRAVING AND ANODIZING THE RESULTANT ASSEMBLY TO A SPECIFIC PREDETERMINED RESISTIVE VALUE.
Claim 2
Independent Claim
92 words
A METHOD FOR THE FABRICATION OF A METAL FILM RESISTOR HAVING A SHORT RESISTIVE PATH LENGTH WHICH COMPRISES THE STEPS OF DEPOSITING UPON A NON-CONDUCTIVE SUBSTRATE (A) A FIRST ANODIZABLE FILM-FORMING METAL OVER A REGION ENCOMPASSING AND LARGER THAN THE DESIRED RESISTIVE PATH, (B) A SECOND ANODIZABLE FILM-FORMING METAL IN INTIMATE CONTACT WITH SAID FIRST ANODIZABLE FILM-FORMING METAL OVER TWO DISCRETE REGIONS OF SUCH CONFIGURATION THAT THE SPACING BETWEEN SAID DISCRETE REGIONS EQUALS IN LENGTH THE DESIRED RESISTIVE PATH, AND PHOTOENGRAVING AND ANODIZING THE RESULTANT ASSEMBLY TO A SPECIFIC PREDETERMINED RESISTIVE VALUE.
References Cited (Backward Citations)
US3148129A
Cited
US3159556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |