US3209646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable overhead projecting apparatus
Assignee: 3M Co
•
Filing: 1962-07-20
•
Granted: 1965-10-05
•
Expires: 1982-07-20
Abstract
No abstract record available.
Inventors
- 👤 Roger H Appeldorn
- 👤 Frank C Lustig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:27
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
IN A PROJECTOR THE COMBINATION COMPRISING A BOXLIKE BASE MEMBER HAVING AN OPEN UPPER END, A FRAME SECTION HAVING OPEN UPPER AND LOWER ENDS TELESCOPICALLY MOVABLE MOUNTED WITH RESPECT TO SAID BASE MEMBER, A TRANSPARENT OBJECT SUPPORTING STAGE CARRIED BY SAID FRAME AT THE OPEN UPPER END THEREOF, A LIGHT SOURCE MOUNTED IN SAID BASE MEMBER, CONDENSING LENS MEANS CARRIED BY SAID FRAME BELOW SAID STAGE AND ABOVE SAID LIGHT SOURCE
Claim 2
Dependent Claim
71 words
IN A PROJECTOR THE COMBINATION COMPRISING A BOXLIKE BASE MEMBER HAVING AN OPEN UPPER END, A FRAME SECTION HAVING OPEN UPPER AND LOWER ENDS TELESCOPICALLY MOVABLE MOUNTED WITH RESPECT TO SAID BASE MEMBER, A TRANSPARENT OBJECT SUPPORTING STAGE CARRIED BY SAID FRAME AT THE OPEN UPPER END THEREOF, A LIGHT SOURCE MOUNTED IN SAID BASE MEMBER, CONDENSING LENS MEANS CARRIED BY SAID FRAME BELOW SAID STAGE AND ABOVE SAID LIGHT SOURCE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |