US3179725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a die
Assignee: North American Aviation Corp
•
Filing: 1960-10-07
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Granted: 1965-04-20
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Expires: 1980-10-07
Abstract
No abstract record available.
Inventors
- 👤 Alvy P Shultz
- 👤 Michael S O'neill
- 👤 Wilson D Kerns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:20
CPC Classifications
B; B21; B21D; B21D37/00; B21D37/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A METHOD OF MAKING A DIE COMPRISING THE STEPS OF PROVIDING A REFERENCE SURFACE TO BE DUPLICATED IN REVERSE BY A WORK FACE OF SAID DIE, COVERING SAID REFERENCE SURFACE WITH A FLEXIBLE PLASTIC GRID COMPRISING INTERSECTING STRAIGHT LINES FORMING RECTANGULAR SHAPED INTERSTICES, COVERING SAID GRID AND SAID REFERENCE SURFACE WITH A HARDENABLE MOIST CERAMIC CEMENT IN PASTE-LIKE FORM, PROVIDING ADDITIONAL STRUCTURAL SUPPORT MEANS SECURED TO SAID LAYER OF CERAMIC CEMENT, ENCLOSING THE OBSERVSE SIDE OF SAID DIE OPPOSITE SAID WORK FACE TO FORM CLOSE CHAMBER MEANS, AND FORMING HOLES THROUGH SAID DIE COMMUNICATING SAID CHAMBER MEANS WITH SAID WORK FACE.
Claim 2
Independent Claim
101 words
A METHOD OF MAKING A DIE COMPRISING THE STEPS OF PROVIDING A REFERENCE SURFACE TO BE DUPLICATED IN REVERSE BY A WORK FACE OF SAID DIE, COVERING SAID REFERENCE SURFACE WITH A FLEXIBLE PLASTIC GRID COMPRISING INTERSECTING STRAIGHT LINES FORMING RECTANGULAR SHAPED INTERSTICES, COVERING SAID GRID AND SAID REFERENCE SURFACE WITH A HARDENABLE MOIST CERAMIC CEMENT IN PASTE-LIKE FORM, PROVIDING ADDITIONAL STRUCTURAL SUPPORT MEANS SECURED TO SAID LAYER OF CERAMIC CEMENT, ENCLOSING THE OBSERVSE SIDE OF SAID DIE OPPOSITE SAID WORK FACE TO FORM CLOSE CHAMBER MEANS, AND FORMING HOLES THROUGH SAID DIE COMMUNICATING SAID CHAMBER MEANS WITH SAID WORK FACE.
References Cited (Backward Citations)
US380099A
Cited
US1571849A
Cited
US1868788A
Cited
US2162229A
Cited
US2206812A
Cited
US2264004A
Cited
US2388528A
Cited
US2447620A
Cited
US2652595A
Cited
US2768595A
Cited
US2763049A
Cited
US2824535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |