US3531335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing films of controlled resistivity
Assignee: Kewanee Oil Co
•
Filing: 1966-05-09
•
Granted: 1970-09-29
•
Expires: 1986-05-09
Abstract
No abstract record available.
Inventors
- 👤 Norman E Heyerdahl
- 👤 Donald J Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:28
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/20; H10P14/22; H10F; H10F99/00; H10P14/29; H10P14/2901; H10P14/2922; H10P14/2923; H10P14/34; H10P14/3402; H10P14/3424; H10P14/3432; H10P14/3438; H10P14/3441; H10P14/3442; Y; Y10; Y10S; Y10S148/00; Y10S148/064; Y10S148/158; Y10S148/169; Y10S438/00; Y10S438/971
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2994621A
Cited
US2847329A
Cited
US2938816A
Cited
US3033791A
Cited
US3312571A
Cited
US3249552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |