US3426727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum whirler for applying thin and uniform coating of an emulsion on a wafer
Assignee: Council of Scientific and Industrial Research
•
Filing: 1965-10-21
•
Granted: 1969-02-11
•
Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Kanwal Singh Balain
- 👤 Inderjeet Singh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:14
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0448; G; G03; G03F; G03F7/00; G03F7/16; G03F7/162; Y; Y10; Y10T; Y10T279/00; Y10T279/11
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1198402A
Cited
US1209693A
Cited
FR659499A
Cited
GB536858A
Cited
US2366935A
Cited
US2387349A
Cited
US2512274A
Cited
US2941499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |