Patent US2997412A successfully refreshed from Google Patents.
US2997412A
Expired / Lapsed
US
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Methods of code drum construction
Assignee: INSTR DEV LAB Inc
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Filing: 1957-02-25
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Granted: 1961-08-22
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Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 Betts Peter
- 👤 Joseph S Lord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:56
CPC Classifications
H; H03; H03M; H03M1/00; Y; Y10; Y10S; Y10S200/00; Y10S200/07; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/1064; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD OF MAKING CODE DRUMS HAVING AN OUTER CONDUCTIVE SHELL PREDETERMINED AREAS OF WHICH ARE ADAPTED TO BE CUT AWAY THEREBY FORMING ISOLATED ISLANDS OF CONDUCTIVE MATERIAL, AND A DIMENSIONALLY STABLE INSULATING TUBE FOR ROTATIVELY SUPPORTING SAID SHELL, SAID METHOD COMPRISING THE STEPS OF HELICALLY SLOTTING SAID SUPPORT TUBE TO RENDER IT RADIALLY EXPANDABLE, COATING SAID TUBE WITH A HEAT HARDENABLE RESIN, TELESCOPING SAID TUBE WITHIN SAID SHELL, RADIALLY EXPANDING SAID SUPPORT TUBE OVER ITS ENTIRE LENGTH WHEREBY SAID RESIN IS SUBJECTED TO A UNIFORM PRESSURE, AND THEREAFTER CURING SAID RESIN WHEREBY ADJACENT SURFACES OF SAID SHELL AND TUBE ARE SECURELY BONDED TOGETHER OVER THEIR ENTIRE LENGTH AND WHEREBY SAID SUPPORT TUBE IS AGAIN RENDERED DIMENSIONALLY STABLE.
Claim 2
Independent Claim
118 words
A METHOD OF MAKING CODE DRUMS HAVING AN OUTER CONDUCTIVE SHELL PREDETERMINED AREAS OF WHICH ARE ADAPTED TO BE CUT AWAY THEREBY FORMING ISOLATED ISLANDS OF CONDUCTIVE MATERIAL, AND A DIMENSIONALLY STABLE INSULATING TUBE FOR ROTATIVELY SUPPORTING SAID SHELL, SAID METHOD COMPRISING THE STEPS OF HELICALLY SLOTTING SAID SUPPORT TUBE TO RENDER IT RADIALLY EXPANDABLE, COATING SAID TUBE WITH A HEAT HARDENABLE RESIN, TELESCOPING SAID TUBE WITHIN SAID SHELL, RADIALLY EXPANDING SAID SUPPORT TUBE OVER ITS ENTIRE LENGTH WHEREBY SAID RESIN IS SUBJECTED TO A UNIFORM PRESSURE, AND THEREAFTER CURING SAID RESIN WHEREBY ADJACENT SURFACES OF SAID SHELL AND TUBE ARE SECURELY BONDED TOGETHER OVER THEIR ENTIRE LENGTH AND WHEREBY SAID SUPPORT TUBE IS AGAIN RENDERED DIMENSIONALLY STABLE.
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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) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |