US3615470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of helical patterns on cylindrical surfaces
Assignee: Corning Glass Works
•
Filing: 1967-09-20
•
Granted: 1971-10-26
•
Expires: 1987-09-20
Abstract
Abstract A method and apparatus are disclosed for forming a pattern by a photoresist technique on a surface which does not readily lend itself to exposure by light from a photographic negative. This method is particularly useful for the formation of patterns on nonplanar surfaces and surfaces which are not easily accessible, such as the inner surface of a hollow cylinder.
Inventors
- 👤 June Singletary Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:46
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/20; G03F7/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
44 words
A method in accordance with claim 1 wherein the step of causing relative longitudinal movement comprises maintaining said light emitting end in a fixed position while rotating said cylindrical bore and concurrently advancing said cylindrical bore longitudinally with respect to said light emitting end.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |