US3535033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple unit projection system
Assignee: Individual
•
Filing: 1968-01-11
•
Granted: 1970-10-20
•
Expires: 1988-01-11
Abstract
No abstract record available.
Inventors
- 👤 Edwin Busch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10; G03B21/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE348527C
Cited
US2031361A
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US2727429A
Cited
US3040622A
Cited
US3051040A
Cited
US3288549A
Cited
US3293807A
Cited
US3283652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |