US3531193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparency holder for overhead projections
Assignee: Individual
•
Filing: 1967-08-11
•
Granted: 1970-09-29
•
Expires: 1987-08-11
Abstract
No abstract record available.
Inventors
- 👤 Robert B Diehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:02
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; G03B21/54; G03B21/64; Y; Y10; Y10S; Y10S353/00; Y10S353/05
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US960519A
Cited
US1997124A
Cited
US2149779A
Cited
US2334329A
Cited
US2330799A
Cited
US2669156A
Cited
US3003394A
Cited
US3169332A
Cited
US3264936A
Cited
US3320854A
Cited
US3362286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-28 | 1974-03-30 | 1974-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-28 | 1978-03-30 | 1978-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-28 | 1982-03-30 | 1982-09-29 | $7700.00 | Window Closed / Lapsed |