US3453159A
Expired / Lapsed
US
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Method for etching a spiral groove pattern with use of a masking apparatus
Assignee: US Philips Corp
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Filing: 1966-03-23
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Granted: 1969-07-01
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Expires: 1986-03-23
Abstract
No abstract record available.
Inventors
- 👤 Jacobus Johannes C Vandersteen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:21
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/106; F16C33/107; C; C23; C23F; C23F1/00; C23F1/02; F16C17/00; F16C17/02; F16C17/026; F16C17/10; F16C17/102; F16C17/105; F16C33/102; F16C33/14; G; G03; G03F; G03F7/00; F16C2220/00; F16C2220/60; F16C2220/62; F16C2220/80; F16C2220/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |