Patent US3516733A successfully refreshed from Google Patents.
US3516733A
Expired / Lapsed
US
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Projection head for compact overhead projector
Assignee: JAMES W LUCAS
•
Filing: 1969-03-26
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Granted: 1970-06-23
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Expires: 1989-03-26
Abstract
No abstract record available.
Inventors
- 👤 James W Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:10
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US465409A
Cited
DE382193C
Cited
US3126786A
Cited
US1445284A
Cited
US1539579A
Cited
GB191242A
Cited
US1967215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |