US3203079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making louvered ventilator
Assignee: SMITH
•
Filing: 1961-01-26
•
Granted: 1965-08-31
•
Expires: 1981-01-26
Abstract
No abstract record available.
Inventors
- 👤 Lester L Smith
- 👤 Frank E Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:11
CPC Classifications
B; B21; B21D; B21D31/00; B21D31/02; F; F24; F24F; F24F13/00; F24F13/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
THE METHOD OF INTEGRALLY FORMING LOUVERS FROM SHEET STOCK WHICH HAVE END REGIONS CURVED IN TRANSVERSE PLANES, WHICH METHOD COMPRISES THE STEPS OF PUNCHING THE SHEET STOCK ALONG A LINE TO DEFINE A LONGITUDINAL LOUVER EDGE AND AN EDGE OF A VENT OPENING, FORMING THE LOUVER TO PROJECT OUTWARDLY FROM THE PLANE OF THE SHEET STOCK AND TO PROVIDE REGIONS AT OPPOSITE LONGITUDINAL ENDS THEREOF WHICH ARE CURVED IN PLANES TRANSVERSE TO ONE ANOTHER, AND COINING THE SAID CURVED END PORTIONS OF THE LOUVER DURING SAID FORMING TO VARY THE THICKNESS OF THE STOCK IN SAID CURVED END REGIONS, THEREBY TO EFFECT ELONGATIONS OF SAID CURVED END PORTIONS IN AMOUNTS RELATED TO THE REQUIRED ELONGATED OF THE LOUVER STOCK IN RELATION TO THE NORMAL DIMENSIONS OF THE SHEET STOCK.
Claim 2
Independent Claim
129 words
THE METHOD OF INTEGRALLY FORMING LOUVERS FROM SHEET STOCK WHICH HAVE END REGIONS CURVED IN TRANSVERSE PLANES, WHICH METHOD COMPRISES THE STEPS OF PUNCHING THE SHEET STOCK ALONG A LINE TO DEFINE A LONGITUDINAL LOUVER EDGE AND AN EDGE OF A VENT OPENING, FORMING THE LOUVER TO PROJECT OUTWARDLY FROM THE PLANE OF THE SHEET STOCK AND TO PROVIDE REGIONS AT OPPOSITE LONGITUDINAL ENDS THEREOF WHICH ARE CURVED IN PLANES TRANSVERSE TO ONE ANOTHER, AND COINING THE SAID CURVED END PORTIONS OF THE LOUVER DURING SAID FORMING TO VARY THE THICKNESS OF THE STOCK IN SAID CURVED END REGIONS, THEREBY TO EFFECT ELONGATIONS OF SAID CURVED END PORTIONS IN AMOUNTS RELATED TO THE REQUIRED ELONGATED OF THE LOUVER STOCK IN RELATION TO THE NORMAL DIMENSIONS OF THE SHEET STOCK.
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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) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |